use desktop pictures on the Mac,
find and open the appearance control panel in your system
folder. Click on the "Desktop" tab to display
the current list of installed textures. Click the small
preview of your desktop to make the pictures button active.
Click the Place Picture... button to select your desktop
picture. Click the Set Desktop button to apply the new
picture to the desktop.
On the PC, click on the Start menu, navigate to
Settings and then to Control Panels. Open the "Displays"
control panel by double clicking it. Select the "Background"
tab and click the Browse button. Locate the picture you
downloaded and select it. Make sure the Display pull down
menu at the bottom of the window is set to "Center"
and click the Apply button.