Here are the instructions to set up wallpaper on a PC running a version of the Windows operating system:

(1)  go to a wallpaper gallery on this website, then left-click the wallpaper you like;
(2)  when the picture has completely finished downloading, right-click on it with your mouse;
(3)  if you're running Internet Explorer choose "set as wallpaper";

Your wallpaper should now be set to the picture which you just downloaded! 

You can download as many wallpaper pictures as you want - when you get tired of one, load another up.