To add wallpapers to your desktop in Windows Microsoft Internet Explorer 6.0+ - Place mouse cursor over the image. - Right click the mouse button. - then Set As Wallpaper clicking the left mouse button once. - Your wallpaper is now set on your desktop. To add wallpapers to your desktop in Macintosh - OSX: Drag the image onto your desktop. - Go to System Preferences & open the Desktop icon. - Then drag the image into the well. - OS9: Drag the image onto your desktop. - Go to your Control Panel & select Appearance. - Click 'set desktop' & choose your new desktop.