The dice roll command is “/roll xdy +- z” where x y and z are numbers, e.g. /roll 1d6+4 would roll a 1d6 and then add 4 to the outcome.
To join or create a new chat room type “/join roomname”.

Note: There appears to be a bug for some users who do not join any channel after loading chat. To solve this type “/join General” and hit enter.