Instructions

On Windows, right-click and select "Set as Wallpaper" or "Set as Background" from the menu.

On the Macintosh, save the image to your hard drive. Select "System Preferences" from the Apple menu, and choose "Desktop & Screensaver". In the Desktop tab, select "Choose Folder," and browse to the folder in which you saved the image. When the image appears in the pane on the right, click on it.