Scusami io ho qusto form ma non so dove inserire i dati che mi hai dato scusami

<form name="registrati" method="post" action="mailto:info@publasiesta.it">
<input type="text" name="textfield">
</form></td>
<td width="10"></td>
<td width="140"><form name="form7" method="post" action="">
<input type="text" name="textfield">
</form> </td>
</tr>
</table>
<table width="290" cellspacing="0" cellpadding="0">
<tr>
<td align="left"><span class="Stile4"><span class="bold">E-mail</span></span></td>
</tr>
</table>
<table width="290" cellspacing="0" cellpadding="0">
<tr>
<td><form name="form1" method="post" action="">
<input name="textfield" type="text" size="45">
</form> </td>
</tr>
</table>