Windows
Right-click on the image "Save As
Background" or "Set as Background".
Mac OS X
Holding Ctrl and clicking the image simultaneously,
choose "Download Image to Disk".
Save the image to your hard drive Desktop,
From the Finder menu choose "Preferences".
In the "Preferences" window, click "Select Picture" and
navigate, using the file explorer that opens for you
to your wallpaper image.
Click "Choose" to confirm your choice.
Mac OS 8 and Mac OS 9
Save the wallpaper image to your desktop or hard
drive.
For Mac OS 8 go to the Apple menu, select "Control
Panel" followed by "Desktop Pictures".
For Mac OS 9 go to the Apple menu, select "Control
Panel" followed by "Appearance". Of the five tabbed
sections in this "Appearance" window choose
"Desktop".
Drag the image from your desktop/hard drive to the
desktop pictures preview window.
Select "Tile on Screen" (Mac OS 8) from the "Position"
pop-up menu.
Click "Set Desktop".