Careful with this one - can be slippery when wet. I suppose you what to know how to get it on the desktop now. Setting the background as your desktop wallpaper 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 you need to go to where your computer's operating system display settings and set the image as your background / wallpaper.
Another way is, when the full screen image has loaded, right click it and choose 'save image as...' or 'set as Desktop Background' or 'Set as Background'. When you're ready - you'll know what to do. I know you can do this. I reckon you know already.I'll keep a lid on it now.
Return to wallpaper thumbnails.