Forum Chat allows forum members to chat in real-time. 

Each forum has its own chat room, which is only accessable by forum members.

There are a few different ways to enter a forum's chat room.  Go to the forum where you want to chat, look at the top of the page (just below the main menu) and you should see a chat bubble: Click the bubble to enter the chat room for that forum.  If the bubble is green it means there are already people in the chat room.

Another way to enter a forum is to go to your list of subscribed forums, locate the forum you want to chat in and click the "options" icon as shown below.

Then, in the options menu, click "Enter Forum Chat Room"

Also, on your subscribed forums list, look for green chat bubbles to tell you which chat rooms are in use.

For help with RallyStorm, visit the RallyStorm Support Forum