• Choose the image size that fits your computer's screen resolution.
• Decide whether you want to have a calendar on your wallpaper or not by unchecking the "Add a Calendar" box or leaving it checked. 
• If you want a calendar, the next step is to select the font for your calendar, the font color, size of the calendar, and where you want it to appear on your wallpaper. 
• Click the "Make Wallpaper" button.  Your wallpaper will appear in your web browser.  If you like the wallpaper you created, you must save it to your hard drive. 
• When the image has fully loaded in your web browser, right click on the image.  A pop-up box will appear.  Click Save Picture As, rename the file whatever you like, and select a folder to store the image.
• DO NOT select "Set as Desktop Item...."  This will not set the image as your wallpaper.  It will set it as part of Microsoft's "Active Desktop" which will either overlap or show behind your wallpaper.  You will pull your hair out trying to get rid of it.  (See below for some helpful hints if this happens.)
• Change your mind about your wallpaper later?  You can overwrite your wallpaper by saving a new image or by going back to what you had before.  Right-click the desktop, select Properties, and click the Background tab.  In XP, after you select Properties, click the Desktop tab.  In Vista, after right-clicking on the desktop, select "Personalize."  Highlight the item you want from the list of options and click OK.
• That's it.

• Click on the image you'd like to set as your wallpaper in the resolution that is appropriate for your screen.
• Allow image to fully load on this page.
• Move the cursor over the image.
• Hold down the mouse button over the image and drag the image to your desktop.
• Open "System Preferences" and select "Desktop."
• Drag the image into desktop pictures window.
• Select the image as your desktop. (You may need to restart your computer for wallpaper to be installed on your desktop.)

Mac Users (OS 9.0)

• Click on the image you'd like to set as your wallpaper in the resolution that is appropriate for your screen.
• Allow the image to fully load on this page.
• Move the cursor over the photo.
• Hold down the mouse button until the drop-down menu appears.
• Choose "download image to disk" (save image to your Mac's hard drive).
• Open the control panel, click on "Appearance" and then select the Desktop tab.
• If there is a "remove picture" button, click it to remove the current desktop window. Then click "place picture."
• A dialog box will appear. Load new wallpaper from the location you selected to save the image on your computer. Press "Open."
• Choose "position automatically."
• Click "Set Desktop."
• Check desktop for new wallpaper. (You may need to restart your computer for wallpaper to be installed on your desktop.)