Add Authorizations are replacing the WebAdvisor Add Codes.  Once a class starts meeting, you need an Add Authorization to register for the class section.  Add Authorizations are issued by the instructor of the class and depend on seat availability.  It is no longer a code that needs to be entered.  It is a system permission that is unique to your ID and section.  All you need to do is go to your schedule in Self-Service and register for the class.