Click on the "Register" button next to an event. Choose the event you'd like to attend from the list. You'll sign in with your SAA username and password, or create an account if you don't already have one. Click on the "Register Myself" button and answer the prompts. Save your responses and proceed to checkout. Even for free events, you will need to click the "Proceed to Checkout" button and "Submit Order" to complete your registration.