1.
Click on whichever of the
links under the picture describes your screen's resolution
(if you are not sure click on the circle at the bottom)
2. Right click your mouse button
when the image is loaded
3.
Left click on either the "Set as
Background" or "Set as Wallpaper" option
(this will depend on what browser you are using)
4.
Minimise all Windows to see
your new Desktop Wallpaper!