I made an announcement on Canvas, however I should say it here also: I have significantly expanded the “How to sign up” page that you can see linked on the left hand side of this page (or you can just click the link in this post).

It now covers not just signing up, but how to go about making comments as well. I have added many new screenshots to help walk you through the process, and once you make your first comment the rest will be easy.

So take a look and see if that helps, but as always you are welcome to contact me if you are still having trouble.