Please note that this is an optional step: there is no need to mark lessons as complete within the Coffee Break Academy.
To mark a lesson as complete in the Coffee Break Academy, simply click on the Complete and continue link on the top right of any page:
Once you've done this, the lesson will show as greyed out in the left hand menu. It is still possible, however, to click on this lesson if you wish to return to it at any time. Note in the image below that Lesson 1 Video is grey and shows a tick on the left. However, you can still click on this link to access Lesson 1 Video.