You can purchase this module on the marketplace: https://extensions.siberiancms.com/downloads/realtime-chat/
With this feature you will be able to create public chatrooms and let your users create their own private chatrooms and chat with each others.
1. First, click on 
in the “Add pages” part. This will appear:
2. To create a chatroom, click on Add a chatroom, enter its name and description and click on OK.
3. In Moderation tab, you can moderate the messages of the chatrooms.
4. The feature in the application.
Tap 
to display the settings of the chatroom.
On this page you can change your nickname and select the type of notifications you want.
To create private chatroom or manage your friends, tap 
on the main page of the feature.
Et voilà!