After clicking on the Chat button, you'll see two sub tabs on there
Main Hall and Rooms.
Main hall is where most of the chatters are.
Clicking on Rooms, you should be able to click on Join by the side of that room. If nothing happens, check to see if you already have that room open and showing to the side of the 'Rooms' tab.
I checked yours, you already have Main Hall selected.
How do I activate "chat" in "live chess"? I click on the chat tab, it shows a list of available rooms, but I can't select/activate a room.
Also, what room do I use for this?