Just use
/sg joinClick the [SurvivalGames] arena 1 sign to join, if enough players join it will start the game automatically. However you can also use
/sg vote to call an early start.
/sg list (shows who is still playing in the match)
/sg help (for more commands)
If you want to leave just use
/sg leave ...and then click the warp back to spawn.
Also
http://kraftzone.tk/server/ now shows survival game stats, might also be including more public player stats within that page at a later date.