This is on a Mac so there's no right click and as far as I know, I'm using the native Mac software to do what I'm doing and not a third party application. This is the history. I read about Gimp being able to do many of the tasks that Photo Shop can do so I downloaded the "stuff" from the Gimp site. Next thing I knew there was a disk icon called "GIMP 2.6.6 Leopard universal" on my desktop. I have since decided that I don't want to use Gimp and am trying to get rid of everything that pertains to Gimp. When I select that icon on my desktop and try to drag it to the cache, I get the message, "The disk "GIMP 2.6.6 Leopard Universal" is in use and could not be ejected. Try quitting applications and try again." I'm looking for a way to deal with the fact that the disk doesn't want to eject.
Thanks to all for their replies and I look forward to hearing more advice.