PC
/ Windows users: Click on
the resolution that best fits your screen, then right click on the
image and select 'set as wallpaper' or
'set as background'.
MAC
OSX users: Click the resolution suitable for your screen,
then drag the image off onto your desktop. Go to System Preferences.
Go to the Desktop icon and open it. Choose the Collection drop down
and Choose Folder to find your new Wallpaper on your computer.
MAC
OS9 users: Click the resolution suitable for your screen,
then drag the image off onto your desktop. Go to your Control Panel
and choose Appearance. Click 'set desktop' and choose your newly
downloaded image on your desktop. Close the window to return here.