As fancy chatrooms, MUSHes are best played with a little bit of support software.

If you've had a look around and think you'll be sticking around, there are a number of downloadable client programs, such as MUSHClient (Windows), SimpleMU* (Windows), Pueblo (Windows), Savitar (Mac), or TinyFugue (UNIX, Mac, Windows). (Not an exhaustive list.)

Failing that, you can telnet in to the game via any standard telnet program, with URL and port 2039.  This is not a recommended option, as telnet is a very raw and user-unfriendly medium.