Add Ninja Forms Regisration

I am using Memberships 2 on one of my sites and it’s a “locals only” private site, when people register, I want to qualify them before they can create a user name and password

so I made a form in Ninja Forms that rejects them.

If they aren’t allowed or passes them on to create the name and password of they are

and I want to divert them, so when they hit”register” instead of going to the registration page they go to the form I made.