Windows Users:
Move mouse cursor over image.
Click and hold down the right mouse button.
A menu window will popup.
Select Set as Wallpaper in the option window
Mac Users (For MAC O/S 8+):
Mmove mouse cursor over image
Click and hold down mouse button.
A menu window will popup.
Choose save image as and save it to your desktop.
Go to control panel and open Desktop Pictures
Click remove picture
Click select picture
Return to saved image and choose position automatically">