Register pop-up/page

On my register page I don't get a form to fill out all I get when clicking submit on one of my options all i get is a new page with "Sign up for Membership - Relax Please check the details of your subscription below and click on the relevant button to complete the subscription. Membership - Relax $12.00 (with a paypal button)" Isn't there or should there be a form that makes the user fill out some sort of info?