For people without a Learn Moodle account, the sign-up button with link to http://learn.moodle.net/login/signup.php is fine - create an account and you are automatically enrolled in the next MOOC.

However it's no good for people who already have an account. If they click the sign-up button they need to be prompted to log in and not create a new account. If they click the log in button, they still then need to find their way to the enrolment page.

The enrolment options page (attached) is not so user-friendly, even with the enrolment instance renamed as 'Join the course'. People using small screen devices don't realise they have to scroll down the page to click the enrol me button.

Also attached is a screenshot of what you see when you attempt to enrol in an Open2Study course. Both options (register or sign in) result in you being automatically enrolled in the course.