Here is a quick guide for connecting to the support chat server with Mac OS X Messages application.

First, launch messages and go to Preferences –> Accounts.  Click the ‘+’ to add an account.

The account name should be <your_username>@iseage.org as shown in the following screenshot.  The server should be “setup.iseage.org”:

Next, do File –> Go To Chatroom… or use the keyboard shortcut COMMAND-R to join a chatroom.  The room name will be “<name_of_chatroom>@muc.setup.iseage.org”:

Repeat the last step for every chat room you want to join.

Congratulations! You’re finished!