I have found a better Java Mux Client that actually works on our site and installed it in place of the old one. When you go to the "Chat (MUX)" page now, you will see a button, when you press that button, a Java client will open in a new window. This one seems much easier to read and use. You can still read the basic instructions on using the MUX on this page as well.
So would I have to create a new account to log on? Also would I show up as staff as I did in flashchat?