first pass your variables
//varibles from form
$Screenname= $_REQUEST['Screenname'];
$Password= $_REQUEST['Password'];
//varibles for email
$from = "From: \"Whoever\" <email@email.com>\nX-Mailer: PHP/" . phpversion();
$subject = "Testing";
$bodytext = "Thank You $Screenname, your password is $Password.";
// function to mail to whover
mail($contact_email, $subject, $bodytext, $from) or die( "Unable to send email");
Something like that. Should work.