Disable "Register" pop up window and redirect to custom page

Hi,

We have a “Pay to read” plugin that requires a special registration page.

However, Geodirectory creates a Login/Register page that will “bypass” our form and it would allow registration without paying (for a type of user that wouldn’t have proper permissions anyways to read our premium content!).

So, how can we replace the cool pop up window for something else, like a simple link to our custom form?

Thanks,

We are using GDv2 and Divi theme.