The bot listen to the commands people write in the IRC channel (#tf2mix). Those commands starts with an exclamation mark (!). The most basic command is !add. This command lets you subscribe to the next game until there's enough players to start one. You need to combine that command with the class you wanna play. Ex.: !add scout

Reporting a player:
!report...
Example: !report Cinq for being afk 10 minutes in that game http://stats.atf2.org/log/dallas_1356343860_gullywash/

List of usefull commands:
!add class (lets you add to a game)
!mumble (sends you the connect information for Mumble)
!need (shows you which classes are needed and how many of them)
!needsub ip:port class color (call for a substitute, only the ip:port argument is mandatory)
!players (list the users waiting for a game)
!status (returns you the current games status that are being played)
!surf class (puts you in a queue for the next captain game)
!remove (removes you from a game)