Desktop backgrounds installation instructions
Windows:
1. Click the desired resolution under the wallpaper of your choice
2. Right-click on the enlarged image and choose "Set as background"

Mac OS X:
1. Click the desired resolution under the wallpaper of your choice
2. Right-click (or press CNTRL + click) on the enlarged image and choose "Save picture as"
3. Click on "System preferences" in the Apple-Menu and choose "Desktop & Screensaver"
4. Go to where you saved the image and activate it