Ciao, guarda io sono ancora alle prime armi con php.. per cui ti metto il codice della pagina index.php e login.php

Se riesci a farmi vedere come si fa te ne sarei grato

INDEX.PHP

<!DOCTYPE html>
<html>
<head>
<title>Login | Effettua l'accesso</title>
<link rel="stylesheet" type="text/css" href="css/materialize.css">
<link rel="stylesheet" type="text/css" href="css/style.css">
<link href="http://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<h3 id="h3"> Effettua il login </h3>


<div class="card cardd">
<form method="post" action="login.php">
<div class="row misure">
<div class="row">
<div class="input-field col s12">
<input id="email" type="email" name="email" class="validate">
<label for="email">Email</label>
</div>
</div>
<div class="input-field col s12">
<input id="password" type="password" name="password" class="validate">
<label for="password">Password</label>
</div>
</div>


<div class="bottoni">
<button class="btn waves-effect waves-light one" type="submit" name="action">Submit
<i class="material-icons right">send</i>
</button>
<button class="btn waves-effect waves-light two" type="reset" name="action">Delete
<i class="material-icons right">cancel</i>
</button>
</div>
<div class="reind">
<ul class="ul1">
<li id="li">Non sei registrato?</li>
<li id="li"><a href="../reg/index.html" target="_blank"> Clicca qui!</a></li>
</ul>
</div>

</form>
</div>


<!--Premesso che i controlli sempre meglio farli al submit del form-->


<script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
<!--script-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.98.1/js/materialize.min.js"></script>
</body>
</html>




LOGIN.PHP
<?php
session_start();


$host="localhost"; // Hostname
$username="root"; // Mysql username
$password=""; // Mysql password
$db_name="materialize"; //Nome del Database
$tbl_name="utenti"; // Nome della Tabella


// Procedimento per connettersi al Database
mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");


// Nome utente e password inviate attraverso il form
$username=$_POST['email'];
$password=$_POST['password'];


$sql="SELECT * FROM $tbl_name WHERE email='$username' and password='$password'";


$result=mysql_query($sql);
// Mysql_num_row is counting table row


$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row


if($count==1){
// Register $myusername, $mypassword and redirect to file "login_success.php"
$_SESSION['username'];
$_SESSION['password'];
header("location:../");
}
else {
echo "Attenzione username o password errati";
}
?>

Dopo avere effettuato il login viene reindirizzato alla home, però non viene visuallizato nome/email e logout!

Grazie mille!