Windows Users: In Mozilla Firefox or Internet Explorer, click on the image. Once the image opens large on your screen, click the image with the right mouse button. On the pop-up menu, select "Set as Wallpaper" to save the image as your desktop backdrop image, or "Save Image As..." to save the image onto your hard drive.
Macintosh Users: Click on the image. Once the image opens large on your screen, press the Control button and click the mouse on the image, and save the image to your desktop. Then go to your System Preferences and click on the "Desktop & Screen Saver" tab. Select Choose Folder, then Desktop, and click on the selected image.