Wp-android and memberships plugin

I am using your membership plugin to manage 3 subscriptions on my site, 2 free subs and 1 paid sub. Users have to choose a sub when they subscribe before they can access member content.

I removed the blog registration button from the login as suggested for single sites (really it is a multi site but with only one site, this was to make use of some MU only plugins).

how do I add a button to the login screen that links to my registration page so I can actually get conversions from this app?