Warning #1: this web client is not very fun to use. If you can find a real MUD client, use the ifMUD java client, or even use a telnet program, that would be preferable. (Links to these can be found on the MUD's front page.) However, in a last resort, this is (barely) usable.
Warning #2: you must type quit to log out. If you just close the window, your character will stay on indefinitely.