You can type following commands to use extra functions while in chat:

/help -> show this text
/clear -> remove all messages
/afk -> toggle AFK (= away from keyboard) status
/join [Room] -> open a new chat-room [Room] /general -> join room ‘General Channel’ for chatting
/msg [USER] -> send message to the [USER] /me : shows your name and purple characters
/roll : rolls a dice
/roll 1,XX rolls a number of dices depending on the number you use instead of XX: e.g. /roll 1,12 rolls 2 dices (max number 12)