...group chat, which we call ChamberChat Rooms. 

In case you haven't already figured it out, here's how to use it:

Instructions:

Look down at the bottom of your screen and you will see a bar like this:

ChamberChat Instant Message (one-on-one chat) is located on the right side:

Click on it to bring up a list of online users you can chat with.  Click on the Gear icon to set ChamberChat options.

On the left side is located ChamberChat Rooms (group chat):

Click on it to bring up a chatroom window and then join or create a room!

Enjoy!