i manage to make it work thanks for the goldfish it help a lot...
to avoid confusion i put in a single container so that it would be
easy to insert
and now its working :)
if ($_POST['azione'] == "UPDATE") {
$result = mysql_query("delete from autoresponder where email = '" .
$testusername . "'");
$df = $_POST['yyf'] . "-" . $_POST['mmf'] . "-" . $_POST['ddf'];
$de = $_POST['yye'] . "-" . $_POST['mme'] . "-" . $_POST['dde'];
$mes = str_replace("'","''",$_POST['message']);
$stat = $_POST['enabled'];
$sub = str_replace("'","''",$_POST['subject']);
$result = mysql_query("insert into autoresponder values
('$testusername','Auto Responder','$df','$de','$mes',$stat,'$sub')");