problema email di conferma per attivazione utente

[cardi_simo]

ciao ragazzi dovrei fare delle piccoli cambiamenti, quando un utente si registra lo porta nella home del sito senza un link di attivazione

questo è il form del mio sito in html

<form action="" method="POST" autocomplete="off">                    {$registerMsg}                    <input type="text" id="short" name="username" placeholder="{$lng->username}" />                    <input type="password" id="short" name="password" placeholder="{$lng->password}" />                    <input type="text" id="short" name="email" placeholder="{$lng->email}" />                    {$captcha}                    <button type="submit" name="register"  class="register-button">{$lng->register}</button>                </form>

questo è per registrarsi fatto in php
il file è chiamato "welcome.php

function PageMain() {    global $TMPL, $LNG, $CONF, $db, $loggedIn, $settings;        if($settings['captcha']) {        $TMPL['captcha'] = '<input type="text" name="captcha" placeholder="'.$LNG['captcha'].'" />        <span class="welcome-captcha"><img src="'.$CONF['url'].'/includes/captcha.php" /></span>';    }             if(isset($_POST['register'])) {        // Register usage        $reg = new register();        $reg->db = $db;        $reg->url = $CONF['url'];        $reg->username = $_POST['username'];        $reg->password = $_POST['password'];        $reg->email = $_POST['email'];        $reg->captcha = $_POST['captcha'];        $reg->captcha_on = $settings['captcha'];        $reg->message_privacy = $settings['mprivacy'];        $reg->like_notification = $settings['notificationl'];        $reg->comment_notification = $settings['notificationc'];        $reg->shared_notification = $settings['notifications'];        $reg->chat_notification = $settings['notificationd'];        $reg->friend_notification = $settings['notificationf'];        $reg->verified = $settings['verified'];        $reg->email_like = $settings['email_like'];        $reg->email_comment = $settings['email_comment'];        $reg->email_new_friend = $settings['email_new_friend'];        $reg->sound_new_notification = $settings['sound_new_notification'];        $reg->sound_new_chat = $settings['sound_new_chat'];                $TMPL['registerMsg'] = $reg->process();
        if($TMPL['registerMsg'] == 1) {            if($settings['mail']) {                sendMail($_POST['email'], sprintf($LNG['welcome_mail'], $settings['title']), sprintf($LNG['user_created'], $settings['title'], $_POST['username'], $_POST['password'], $CONF['url'], $settings['title']), $CONF['email']);            }            header("Location: ".$CONF['url']."/index.php?a=feed");        }    } 

questo qui è nel classes.php del mio sito per registrarsi

class register {    public $db;                          public $url;                          public $username;                    public $password;                     public $email;                        public $captcha;                     public $captcha_on;                     public $message_privacy;            public $verified;                    public $like_notification;            public $comment_notification;        public $shared_notification;        public $chat_notification;            public $friend_notification;        public $email_like;                    public $email_comment;                public $email_new_friend;            public $sound_new_notification;        public $sound_new_chat;        function process() {        global $LNG;
        $arr = $this->validate_values(); // Must be stored in a variable before executing an empty condition        if(empty($arr)) { // If there is no error message then execute the query;            $this->query();                        // Set a session and log-in the user            $_SESSION['username'] = $this->username;            $_SESSION['password'] = md5($this->password);                        //Redirect the user to his personal profile            //header("Location: ".$this->url."/something");                        // Return (int) 1 if everything was validated            $x = 1;                        // return $LNG['user_success'];        } else { // If there is an error message            foreach($arr as $err) {                return notificationBox('transparent', $LNG['error'], $LNG["$err"], 1); // Return the error value for translation file            }        }        return $x;            }        function verify_if_user_exist() {        $query = sprintf("SELECT `username` FROM `users` WHERE `username` = '%s'", $this->db->real_escape_string(strtolower($this->username)));        $result = $this->db->query($query);                return ($result->num_rows == 0) ? 0 : 1;    }        function verify_if_email_exists() {        $query = sprintf("SELECT `email` FROM `users` WHERE `email` = '%s'", $this->db->real_escape_string(strtolower($this->email)));        $result = $this->db->query($query);                return ($result->num_rows == 0) ? 0 : 1;    }        function verify_captcha() {        if($this->captcha_on) {            if($this->captcha == "{$_SESSION['captcha']}" && !empty($this->captcha)) {                return true;            } else {                return false;            }        } else {            return true;        }    } 

il problema è che devo mettere questi piccoli codici nel sito e non so dove inserirli

<?php
 
class NewUser
{
    public $conn;
 
        public function AddUser()
        {
            $this->ErrorReport();
        }
 
        protected function DbConnect()
        {
            include "db_config.php";
 
            $this->conn = mysql_connect($host,$user,$password) OR die("Impossibile connettersi al database");
            mysql_select_db($db, $this->conn);
        }
 
        protected function IsEmptyField()
        {
            if(empty($_POST['username']) OR empty($_POST['email']) OR empty($_POST['password']))
            {
                return TRUE;
            }
            else
            {
                return FALSE;
            }
        }
 
        protected function VerifyPassword()
        {
            if($_POST['password'] == $_POST['password2'])
            {
                return TRUE;
            }
            else
            {
                return FALSE;
            }
        }
 
        protected function UsernameExists()
        {
            $this->DbConnect();
            $sql = "SELECT username FROM users WHERE username='$_POST[username]'";
            $res = mysql_query($sql, $this->conn);
            if($row = mysql_fetch_array($res))
            {
                mysql_close($this->conn);
                return TRUE;
            }
            else
            {
                mysql_close($this->conn);
                return FALSE;
            }
        }
 
        protected function EmailExists()
        {
            $this->DbConnect();
            $sql = "SELECT * FROM users WHERE email='$_POST[email]'";
 
            $res = mysql_query($sql, $this->conn);
            if($row = mysql_fetch_array($res))
            {
                mysql_close($this->conn);
                return TRUE;
            }
            else
            {
                mysql_close($this->conn);
                return FALSE;
            }
        }
 
        protected function VerifyEmail()
        {
            $pattern = "^([a-zA-Z0-9])+([a-zA-Z0-9]+[-_\.]?)*([a-zA-Z0-9])+(@)([a-zA-Z0-9])+([a-zA-Z0-9]+[-_\.]?)*([a-zA-Z0-9])+(\.[a-z]{2,4})$";
 
            if(ereg($pattern,$_POST['email']))
            {
                return TRUE;
            }
            else
            {
                return FALSE;
            }
        }
 
        public function ErrorResult($num)
        {
            header("Location: form.php?alert=" . $num);
            die;
        }
 
        protected function ErrorReport()
        {
            if($this->IsEmptyField())
            {
                $this->ErrorResult(1);
            }
 
            if(!$this->VerifyPassword())
            {
                $this->ErrorResult(2);
            }
 
            if($this->UsernameExists())
            {
                $this->ErrorResult(3);
            }
 
            if($this->EmailExists())
            {
                $this->ErrorResult(4);
            }
            if(!$this->VerifyEmail())
            {
                $this->ErrorResult(5);
            }
 
            $this->InsertNewUser();
 
        }
 
        protected function GetKey()
        {
            $car = "aAbBcCdDeEfFgGhHiIlLjJkKmMnNoOpPqQrRsStTuUvVwWxXyYzZ0123456789";
            $dim = 40;
            srand((double)microtime()*1000000);
            $string = '' ;
 
                for($inc=0; $inc<$dim; $inc++)
                {
                    $rand = rand(0, strlen($car)-1);
                    $scar = substr($car, $rand, 1);
                    $string = $string . $scar;
                }
 
            return $string;
        }
 
        protected function SendUserMail($key)
        {
            $content = "Benvenuto $_POST[username],\r\n";
            $content .= "per confermare la tua iscrizione devi cliccare sul seguente link:\r\n\r\n";
            $content .= "http://www.itworldlive.it/prova/prova/verify_user.php?key=" . $key;
 
            mail($_POST['email'], "Iscrizione al sito...", $content, "From: Benvenuto su World Live <simone_cardillo@hotmail.it>");
 
            return;
        }
 
        protected function InsertNewUser()
        {
            $password = md5($_POST['password']);
            $key_control = $this->GetKey();
 
            $sql = "INSERT INTO users (username,email,password,key_control) VALUES ('$_POST[username]','$_POST[email]','$password','$key_control')";
 
            $this->DbConnect();
 
            mysql_query($sql,$this->conn);
 
            mysql_close($this->conn);
 
            $this->SendUserMail($key_control);
        }
 
        public function VerifyUser()
        {
            $sql = "SELECT id FROM users WHERE key_control='$_GET[key]'";
            $this->DbConnect();
            $res = mysql_query($sql,$this->conn);
 
            if($row = mysql_fetch_array($res))
            {
                $query = "UPDATE users SET ver=1,key_control='0' WHERE id='$row[id]'";
                mysql_query($query,$this->conn);
                mysql_close($this->conn);
                 header("location: http://www.itworldlive.it"); 
                echo "Il tuo account è ora attivato!";
            }
            else
            {
                echo "Impossibile verificare l'account!";
            }
        }
}
 
?>

come posso fare ragazzi, al posto di NewUser e AddUser dovrei mettere il nome "register o username" oppure va bene così? grazie se mi aiutate sto impazzendo