PC Download Instructions
1. Right-Click on the image and choose "Set As Wallpaper".

MAC OS X Download Instructions
1. Control-click on the image and select "Download Image to Disk".
2. Save image to desktop
3. Go to Apple Menu > System Prefereneces > Personal Section and select "Desktop".
4. On the "Collection" pulldown menu, go to "Choose Folder" and locate the appropriate wallpaper.