Registration forms are what you find under Settings → Remote Access.
This is a form your studio will put on your website so that new students can fill out their information and automatically be entered on your People list with the status of “New”. This has nothing to do with scheduling.
The enrollment form is found under the Calendar menu, and is only for allowing students to sign up for specific classes on the calendar, by clicking the event on the calendar after they login. It’s not really a “form” for students, except that they click that they want to attend that series of events, and then pay for their lessons.