Type a message in the text box at the bottom of the chat room, and press Enter on your keyboard or click Send.
If you think new messages are not appearing on your screen fast enough, click Refresh at the top of the chat. This option appears when you select New Messages in Settings.
The Participants pane displays a list of users currently signed in to a chat room.
Links:
[1] http://staging.docs.d2l/en/taxonomy/term/3