Ah - good choice - this is one of my favourites! I suppose you what to know how to get it on the desktop now. To get your chosen wallpaper to be set as your desktop background can be done in many 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.
A different way altogether is to right click the background below, from here choose 'save image as...' or 'set as Desktop Background' or 'Set as Background'. You will understand what needs to be done the the moment arrives.A walk in the park for you. In fact you probably already know. I'll be quiet then.
Return to wallpaper thumbnails.