After you have registered on the Code Reality: Learn platform, you still need to "Enroll" into a course to get access to the materials. 

1. Click the red button "Click here to access the course" next to the course you would like to participate in. You are likely to get an error message like this:

2. Close this pop-up window. And you should be able to see a page with enrollment options.

3. Click the red button "Enroll me", like on the image below:

4. You should now get access to the course you enrolled in.