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-http://evercube.net/forum/ftb2nameimp.php
1) Load game.
2) At any desired time, open nitePR and highlight name imposter.
3) Turn cheats on by pressing the note button.
4) You should see your name show up as your imposter unless you activate this code while you are already in a room.
NOTE: If you are already in a room, just leave and come back, and your name should be showing.
Enjoy!