I have RSMemberships and Jomsocial installed. I want users to sign up for jomsocial first, then for rsmemberships because it gives me more control over the mandatory fields (If a user account is created by rsmemberships then the mandatory registration fields in jomsocial are never enforced).

My question is, on the rsmemberships registration page, how do I remove the option for new user registration and only show the sign in option?