Membership plug-in has Facebook register button (but it doesn't work)

Hello there.

I have a membership access level I am working on setting up. I believe I am very close, however, when I click on the button to "take the course for free", it takes me to a login page. On this page, there is a Register with Facebook button. When I click it, the same page loads.

Thanks in advance - you guys have been more help in 3 days than any other site in MONTHS.