It's easy to self-register. Click the Signup button in the navigation bar above, fill in the requested information and click 'Create account'.
You will receive an email confirming your registration.
Once you have confirmed your registration, go to the course catalogue and select either 'Access for All' or 'Access for All (Accessible version)'.
The course can be done module by module (20-30 mins) or in one sitting (2-3 hours).