Windows

1. Select the link for the dimensions of the picture to download for your screen resolution.
2. Using the mouse, right-click on the wallpaper image.
3. If available, choose "Set as Wallpaper" or "Set as Background" from the menu that appears.
4. If not, choose "Save Image As", then choose a file name and add ".jpg" (save the image to your desktop so it is easy to find).
5. From the Start menu, go to Settings, Control Panel, Display, then Background - choose "Browse", go to "Desktop", then open the "jpg" file and click "OK".

Macintosh OS 9

1. Select the link for the dimensions of the picture to download for your screen resolution. If in doubt, select the largest picture, as your Mac will adjust the size of the image to fit your desktop.
2. Holding Ctrl and clicking the image simultaneously, choose "Download Image to Disk".
3. Save the image to your hard drive, preferably in System | Appearance | Desktop Pictures.
4. Go to the Apple menu, select "Control Panel", followed by "Appearance". Select the "Desktop" tab.
5. In the "Desktop" tab, click "Place picture" and navigate, using the file window that opens for you, to your wallpaper image.
6. Select "Position Automatically" from the "Position" pop-up menu.
7. Click "Set Desktop".

Macintosh OS X

1. Select the link for the dimensions of the picture to download for your screen resolution. If in doubt, select the largest picture, as your Mac will adjust the size of the image to fit your desktop.
2. Holding Ctrl and clicking the image simultaneously, choose "Download Image to Disk".
3. Save the image to your hard drive in Library | Desktop Pictures.
4. Holding Ctrl and clicking on your desktop simultaneously, choose "Change Desktop Background...".
5. Click on "Desktop Pictures" (or select from dropdown) and select the downloaded image.
6. Close the System Preferences window.