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PC: Select the appropriate screen resolution. Once the image has finished loading, right click on the picture and select Set as Background.
Mac: Select the appropriate screen resolution.
Once the image has finished loading, click and hold your mouse button
over the image. In the resulting menu, select Save Image.
Choose a location on your hard drive. Open the image with your installed
image editor. Select and copy the image to your clipboard using Command-C.
Under the Apple Menu, choose Control Panels, then Desktop
Patterns. Paste the contents of the clipboard to the open
palette and click Set Desktop Pattern.