with ~ being your Mac’s username. (The name to the right of the little white house.)
All actions should go in that “Actions” folder and not in the location you have been using. You can also drag the MooTools action bundle over your Freeway icon in your Mac Os dock and it will drop the action in that folder listed above. That might be easier for future reference.
Just remember that MooTools and the native FW script/protaculous based actions dont play well together and you should avoid using them on the same page.