For springlobby:
-Open a private chat with one of the springie hosts
-Type the command to spawn a new battleroom, something like "!spawn mod=zk:stable,title=myGameName,password=secret"
From there the game should show up on the battle list hosted by springieX, X being some number. Join it. From there to change game settings type !help for info. Common commands are !map MAPNAME, !balance, !boss PLAYERNAME, !vote, and !start.