You can click on the Participants link (look right -> ) to see who else is taking this course. If you click on somebody's name, you will see their Profile.
Under their Profile, you will see a button that says Send message.
Click on this and a window will open and you can type a message to that person
Online Users tells you who is online right now.
You can click on the name of the person and send them a message.
Check to see if you have any messages...
Look right -> at the Messages block.
If you see a name in tiny blue writing and a teeny tiny envelope with a teeny tiny number beside it, you have a message!
Click on the name to see that person's profile.
Click on the teeny tiny envelope to read your message.
Click on reply to send a message back.
The message block looks like this when there are no messages:
And this when there are messages: