Adding Subscribe Now & Payment options to Sign-up Process

I am having an issue as my registration/sign-up page doesn't look like the 4th screenshot on this page Neither does it go to a second registration page like it does on WPMU after one signs up. I have the basic sign-up page (attached). How do I get it to reflect the subscription options at sign-up? I have a Free and Premium subscription option.

Instead of seeing the "Complete Sign Up" button, what should the button show if there was a second page where subscription options were?

This is vexing me. Please help. Thanks.