How can I register for a course that requires special permission or has a class restriction?
You need to get permission, in writing, from the instructor. A class restriction means that you do not have the class standing to register for that course (i.e. you need to be a Sophomore to register for Art/Mus/Thr 200x). Most instructors will stick to a class restriction, unless you have special circumstances (such as completing courses during the summer to have the desired class standing by the start of fall semester).