Users are asked to have your car number at the beginning of your nickname (just to help race control identify each user). Change this by right clicking your name in the TS window and select "change nickname"
During the race, users are asked to be in any channel that is beneath "pit wall". Most stay in "race control audio only": this channel does not allow users to speak to each other, but you can hear race control. As you can see, some teams have channels in this area so team mates can talk to each other, but race control can still talk over them. If you want a team channel created, inform Dekojester.
After the race, if you are interested in being interviewed on the sim broadcasts stream, move yourself to "commentary box waiting room" and the broadcast team will pull you into the commentary box when they feel it is appropriate.
You move channels by double clicking on the channel name.