A lot of people have been asking in the chatbox how to do some of the commands, so I'm posting them here for reference.
Writing a message in third person
/me *message*
will appear in the chatbox as:
* [your username] *message*
Logging off with a message
/exit *message*
will appear as:
[your username] has logged off the chat at ____ : *message*
Marking yourself as away
/away *message*
comes up as:
[your username] is away : *message*
And that's all of the non-moderator commands!