To set the wallpaper as your desktop: Right-click anywhere on your desktop, and click on "Properties...", and then click the "Desktop" tab. Browse through the files to find the holiday wallpaper that you downloaded, and set it as your desktop. Congratulations, you have a brand new holiday wallpaper!

To put your new cute holiday wallpaper on your cell phone, you will need to consult your cell phone's manual. You may need an SD or micro SD card in order to transfer files to your phone. If your phone is capable of browsing the internet, you may also be able to email the image to yourself (I don't have an automated mail-system) and then download it to your phone. Each phone is different, so I can't tell you exactly how to set it as your phone's background.