There are a number of commands for modifying various characteristics of the object representing you in the MOO, your 'player'. Help on them is available in the following topics:
@describe -- setting what others see when they look at you @gender -- changing your player's gender @password -- changing your player's password @sethome -- changing your designated home room @rename -- changing your name and/or aliases @linelength -- adding word-wrap to the lines you see