How do I make a registration form with the option to subscribe?

What does the member pages in BuddyPress have to do with it? Should I delete BuddyPress?

I simply want to subscription levels (free and premium). New users who register automatically become free members. I want to offer the option to upgrade to a premium level. I have my gateway set up... How do I build the registration forms with the premium subscription level and payment option?? Ive been through the Membership Guidebook but it in these forms magically appear... they dont for me. Please advise.