there jack, Thanks for your reply. I see all registered

Hi there jack,
Thanks for your reply.
I see all registered users are seems to be affiliates. But we have a technical problem here.
First, its not about custom registration form, we already have it in
http://legiontraining.wpengine.com/registration ( not in http://legiontraining.wpengine.com/wp-signup.php )
But see, we have free registration features, and it has some expiry period. And only after expiry period, users will pay. So, I want a different form so that only interested users can be affiliates