Windows Users: After choosing your favorite wallpaper, click on correct resolution for your monitor display and wait for the image to finish loading. Right-click on the full-size image and select "Set As Wallpaper" from the pop-up menu to make the image directly into wallpaper.
Mac OS Users: Control-click on the correct resolution for your display and select "Download Image to Disk" (Internet Explorer) or "Save this Image as" (Netscape). Save the file to a location that you will remember. Then go to the Appearance Control Panel, and choose the "desktop" tab. Click on "Place Picture" Choose the picture you just saved and click on "set desktop."