Forgive me if I'm just being dense, but I can't, for

Hi,

Forgive me if I'm just being dense, but I can't, for the life of me, figure out how to correctly set up the pro sites plugin.

I've read the instructions, searched the forum, messed with the settings, disabled all other plugins and switched the theme and no matter what I do, the signup form on the site only displays a broken form with payment term options and no submit button (screenshot attached).

Can anyone tell me what I'm doing wrong?

Thanks!

- Scott