I couldn't find "Membership Settings -> Registration Settings -> Suspend Registrations?" but I did find "Primary Settings | Registration Settings | Suspend Registrations". I set the radio box to "Do not accept new registrations."

But I cannot locate the link to "add user" from the control panel. Any chance you are speaking of UBBT and not UBBC?

Now that self-registration is suspended, I need to have the Admin create users.