To add your own choice of Censor Words on your Chat Room, simply open "pfcglobalconfig.class.php" in your phpfreechat/src/ directory and search for the string below:
"censor" => array("words" => array
.. you will see the default words after "array", where you can add your own Censor Words with ("***","***","***","***"), ... where *** = each word you wish to add.
All the best,
Cal