Hi Anthony! You can enter chat one of two ways. Approximately 5 minutes before game time if you log on to www.mavs.com you should see TV Companion come up, if you look on the upper right hand corner of the screen you will see "Interact" and below that you will see "Chat". Just click on Chat and it takes you right to it. On www.mavs.friends.com you can also click on the "Site Links" tab at the top of the page and scroll down to chat.
I hope to see you there, it's great fun....just a bunch of Mavs fans talking about the game!