Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
That really doesnt matter. When on the desktop click apple + j, then click show preview or something like that. The picture will then be there. Tell me how that works.
 
that made it so the icon shows up in the finder, but not that little icon in the corner of the get info screen
 
Sounds to me like the icon you are trying to use is not a .icns file. Maybe I am just reading your problem wrong. Are you trying to apple an icon, but it doesn't show, instead a stock "image" icon appears?
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.