If you click on one of the labled tabs it will give a team message for easy use.
If you join a team and wish to view the loot/money split you can use the create team command to list this. When leaving, or disbanding, a team just click on the X in the upper right corner. A member will leave the team when this is done, and if the leader does it, the entire team is disbanded. Team members will be listed under this command box. There will be a name with a health bar just like that shown in the HUD. This helps track who needs healing and such, also you can just click on the name in the list to target that member for any skills you wish to use on them (say a nice heal).