My contact form – I’ve changed the source code but the changes are not being applied

It is because you are overidding your values in custom.js:

$('#quickName').val('your name');
$('#quickEmail').val('your email');
$('#quickComment').val('your message');

Remove these lines and you should be good to go.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)