I seriously doubt that those are correct paths on your server. Go to Reports -> System Info, and click on the view link for phpinfo(). Scroll to the bottom and look for the SERVER variables. Look for one called _SERVER["DOCUMENT_ROOT"]. You’ll need to add any subdirectories to this if your MODx installation is not in that root directory (mine, for example, is in a subdirectory named 5615).
If you’re using 1.0, the file paths will be displayed on the main System Info page, just above the database display grid.
MODX_BASE_PATH /Applications/MAMP/htdocs/5615/
Also be aware that the two in Interface & Features are for the resource browser in the Rich Text editor (inserting images and such), while the one in the File Manager tab is for the File Manager.