Please help

In college, if I’m planning on taking summer *and* fall semester classes, should I register for both at the same time? They have a hold on my registration since I did register for summer. but they’re doing priority fall registrations today and tomorrow at the school, I’m wondering should I go up there and have them take the registration hold off so I can register for fall? Or does this mean I have to wait until the end of the summer semester to register for fall? I don’t know this because I’ve never taken the summer courses before.