registration

I have a pro account.  I am setting up a meeting where we want people to preregister so we can assign meeting rooms for a breakout.  However, when I check the "registration" box no "tab" appears to allow creating the registration form.  When you look around the site,  you have to have a certain kind of account, which of course is not shown as an option anywhere in my profile or on the accounts page.  How on earth do you create the registration form.  The help center, like all help centers, is of no help.