To register for a SSA, you must first contact your Student Success Counselor. This will go over important information and talk you through the requirements. Your Student Success Counselor will register you into the course shell (study materials). Access to your SSA will begin on a normal term start, giving you the chance to begin your self-study at the start of any A, B, C or D term. Once the SSA term begins, you will have 16 weeks to complete your self-study and attempts at your essay and final exam.
To read more about SSA's available take a look at What SSA's can I take?