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Dasher is correct,

Or you may want to assign $dbusername to a session:
session_start();
$_SESSION['dbusername'] = $dbusername;

Then echo $_SESSION['dbusername'] in the second page where you...

Okay, try something like this:
CODE:
<?php
$con = mysql_connect("localhost","","");
mysql_select_db("user",$con);
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
$sql="INSERT INTO...

$email_query= mysql_query("SELECT email FROM members WHERE email='$email' LIMIT 1")or die("Could not check Email");
$count_email = mysql_num_rows($email_query);

Please change the variable...