Where can i locate my username?

According to the instructions, I go to Setup > Chat > External IM Client. The problem is there is no "External IM Client".  Only "Settings" and "Triggers".  I'm trying to find my "1.admin.9990"username to test a Jabber client and it's nowhere to be found.  I've looked in every tab and my username doesn't exist.  My widget is useless if I can't test the functionality of UserEcho.