- Go to Tools->Accounts.
- Go to Add.
- Set the protocol to Jabber, and input your CS username. Set the server to im.cs.earlham.edu.
- Go to more options, and make sure TLS is enabled on port 5222.
You're good to go. Click save, and then go on-line.
You need to add a user as a buddy in order to talk to them. Go to Buddy list->Buddies->Add buddy, and type in their CS user name followed by @im.cs.earlham.edu. For example, the user joe would expand as firstname.lastname@example.org. Make sure your account is set to your CS account.