MightyGem,
You are on a Mac as you say yourself and Mac's don't have the right click menu set as background option....John Eacott's instructions up top mention that you need to download the picture first and then set it via system preferences...
To download just press command+s (or go on the down arrow you find below the word File) this will ask you where to download it.
The go to the top left of your monitor and click on the Apple followed by System Preferences, now in the Personal Column click on Desktop & Screensaver now toggle the Desktop / Screensaver to Desktop choose folder choose picture Done.
Am I making sense?
Last edited by Brilliant Stuff; 7th Feb 2013 at 11:29.