I need help trying to get my webpage to go to a thank you page if all validation are true and entered correctly then it would go there. But I have no luck trying to get it to work. If there is any way that I can fix it.
Assuming that this code from your codepen validates before submit.
if (isValid == true) {
$("registration_form").submit();
}
You have to add:
if (isValid == true) {
$("registration_form").submit();
window.location.replace("http://example.com/ok.php");
}