My Account > Preferences > User Info
User Info Screen
The top-half of the screen allows you to change your Stage Name. Also, if you would ever like to change the E-Mail Address you login with, or if you would like to change your login Password, you could do that here as well.
The bottom-half of the screen allows you to adjust the amout of inactivity you are allowed to have before PerformerTrack automatically log's you out of the system for security purposes.