I've tried to follow this simple guide for changing icons but it doesn't work. http://www.apple.com/support/mac101/customize/6/ When I click on an icon file - *.icns that I downloaded from interfaceLIFT - get info - Edit - Copy is grayed out. Tried it on several different files. Tried just copying the icon file but then when I get info of the application that I want to change the icon of Paste is greyed out. I'm obviously missing something.