Download the file to match the size of your monitor display.
To Use on Your Desktop
1. Click on the resolution most closely matching your desktop.
2. The calendar will open in a new window. Right click the calendar and select "Set as Background" or "Set as Desktop Background".
Mac OS X Users:
Drag it onto your desktop, go to System Preferences, go to the Desktop icons, click the Collection drop-down and Choose Folder to find the new wallpaper on your computer.
Mac OS 9 Users:
Drag it onto your desktop, go to Control Panel and choose Appearance, click Set Desktop and choose the new wallpaper that you just downloaded.