2
I think you have to modify the file register.php
on the line 126
$user_mailok = (isset($_POST['user_mailok']) && intval($_POST['user_mailok'])) ? 1 : 0;
you`ll have to change the value of one to 0
so the code shall be this:
$user_mailok = (isset($_POST['user_mailok']) && intval($_POST['user_mailok'])) ? 0 : 0;
I am not sure about the end result but i guess that shall work fine.