Select your resolution size. The design will open in a new window. Install as follows:
Right-click on the image and choose "Set As Background" or "Set As Wallpaper"
MAC OS X USERS:
1. Control-click and select "Save Image As..."
2. Save the image to your desktop
3. Go to Apple menu "System Preferences" and select "Desktop Screensaver"
4. In the menu at left, select "Choose Folder..." and locate and select the image on your desktop