To download these free Wallpapers to your computer, simply find the one that suits your screen resolution and right-click on the image. Select "Save As" from the options and it begin the download.
To set one of these as your Desktop Wallpaper, click on the link for your screen resolution. Once the image has loaded, right-click and select "Set As Background". Once your done, click the "Back" button on your browser to return to the site.