Subscription not on Register page

Hi,
I dont want to have the Subscription on the Register page

http://partykompass.de/registrieren/

My Users should First Register. Cause its approved by the Admin.
Then i give the 7 days testing.

They should be able to to select their own Subscription After testing.

I dont understand how to do that.

I need a Special page for sign up for Subscription i think.

Cheers,
Denis