You can send an instant message to your classmates/other users from the Classlist. 

To send an instant message from Classlist 

1. From your module navbar, choose Class Organisation and then,Classlist. 

2. Select the checkbox of the user(s) you want to message. 

3. ClickInstant Message above the list of users. 

4. In the Send Message window, write your message. 

5. Click Send.

Result

The instant message has now been sent to the selected classmates.