Mac Instructions
1. Click on the size for the graphic you want
2. When the picture loads, hold down the "control" key and select "save image as"
3. Save the file to your hard drive
4. Open system preferences and select "desktop + screensaver"
5. Click on "choose folder" and select picture
PC Instructions
1. Click on the size for the graphic you want
2. When the picture loads, right click on the image with your mouse
3. Select "set as wallpaper" from the pop-up window