Careful with this one - can be slippery when wet. I suppose you what to know how to get it on the desktop now. Getting the wallpaper onto your desktop background can be done in a number of ways. You can either right click background wallpaper below and then click 'save target as...' (IE & Opera) or 'save link as...' (Firefox). Please remember where you save it to!Next goto your computers display control panel and set the background to the image you just saved.
Alternatively, when the full screen image is up, right click it and select 'save image as...' or 'set as Desktop Background' or 'Set as Background'. You'll know what to do when the time comes. I've never felt so sure of anything. In fact you probably already know. I'll be quiet then.
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