Hi Mark!
Does this mean I need 3 separate sign up pages? Is it possible to have a single sign up page where a user can select between the 3 options?
Unfortunately, this is not possible in the conventional sense. s2Member does not support multiple Pro Forms within a single page because various Pro Forms use the same HTML form IDs, which can cause issues when the form submits. We recommend that you link the various Pro Form pages from within the Membership Options Page as well. You can see a live example of this at http://www.s2member.com/prices/.
It could also be possible to use an AJAX routine within the page, or an HTML form to change the page based on PHP $_GET variables. For both of these you will need a coder adept in jQuery/PHP (respectively), and you’ll end up with a rather cluttered page within the WordPress® Dashboard.
Therefore, we suggest separate pages linked within the Membership Options Page, as seen on s2Member.com.
I hope that answers your question!