Se você quer dizer o Chax do iChat-Addon, de acordo com o site:
Removing Chax
There are two ways to remove Chax. The quickest way is to run the Chax installer and select "Remove". To manually remove Chax, open~/Library/ScriptingAdditions
(~ indicates your home folder) and moveChaxAddition.osax
to the trash. After logging out and back in, empty the trash.