Courteous behavior is required at all times in the chatbox. If anyone is unkind to you, send email to the site administrator via the Contact form and the person who is unkind will be banned from the site.
The chatbox supports multiple channels, each on a different tab. Two channels are always available - meeting (for online meetings) and check-in (for checking in via chat). They are supposed to be created automatically, but if they aren't, you can create them by typing this (or clicking on the links):
You also can create additional channels using this syntax: /join mychat
where "mychat" is whatever name you like. You can use this for private chats or chats that aren't check-ins or meetings. :)