Membership Display

I am having trouble getting the membership subscription setup. I appologise if I am missing the obvious on this!

The setup I want is a simple one. Visitors and premium members.
Visitors can browse the site but not submit anything. Members can do everything.

I have noticed that my theme has 2 sign up buttons. Clicking signup on the login bar takesyou to the page set in the membership options but the signup on the button takes you to the default bp signup.
However changing the page on the membership options page still fails to show the subscription?
I do have my premium mebership set to a 30 day trial, do the paypal options not appear until the 30 days?
Bit baffled by the instructions maybe?

Kind regards
Mark