Membership Popup Registration custom link

I have two questions regarding the pop-up registration form on the membership plugin.

1) Is there a way I can create a custom link that brings up the pop-up registration form.

I have created a link like this:

but it just links to a separate page. What else do I need to include?

2) Can I combine all subscriptions on one pop-up form so a client can choose? something like this

Untitled Link