Yeah, it’s a bit tricky. There are two library folders on a mac, and they are both hidden by default. If you are playing with XBMC, you’ll have to use them both at some point.
1) The main one is easiest to access. Just hold down the option key while choosing “go” from the finder menu bar. It will give you an option to go to the library
2) However the folder you are looking for is trickier to access. It's location (from the hard drive)is Users/ your user name/library/Application Support/XBMC/addons/ and you'll delete the "script.games.rom.collection.browser" folder to reset
Sadly. I don’t know a easy way to unhide the user library folder. The only way I’ve found is to unhide the library files through terminal. Here;s instructions on how to do that, so you can access the folder in question. (and restore back to the original settings if you want)
Here's how to do that.
Show User ~/Library in OS X Lion & Mountain Lion
Launch Terminal from Spotlight or Launchpad -> Utilities, and enter the following command to show or hide the directory:
chflags nohidden ~/Library/
The users Library folder will immediately become visible again. Reverting this back to the standard Lion setting is simple too:
Hide User ~/Library in OS X Lion (default setting)
This returns to the default setting of hiding the user Library directory:
chflags hidden ~/Library
Changes take effect immediately again, and Library becomes invisible to the user.
http://osxdaily.com/2011/07/04/show-libr...os-x-lion/