PC Instructions
1. Click the screen size of the wallpaper that matches your screen size.
2. Wallpaper will appear in new window.
3. Right-click this wallpaper; select "Set as Background."
 
Mac Instructions
1. Click the screen size of the wallpaper that matches your screen size.
2. Wallpaper will appear in new window.
3. Save this image to your computer.
4. Go to System Preferences; click "Desktop & Screensaver."
5. Select wallpaper saved on your computer.