How to change the wallpaper background of the screen that is displayed when the computer is locked in Windows 8.

Follow these steps to change the Lock screen wallpaper background.

1. Point to (but do not click) the lower-right corner of the screen, and click the Settings charm.
   

   NOTE: The Win + I key combination will also take you to the Settings screen.

2. In the Settings screen, in the lower-right corner, click Change PC settings.
   
3. In the PC Settings screen, on the Personalize tab, click Lock screen.
4. In the Lock screen section of the PC settings screen, click one of the displayed image options or click the Browse button to use an other picture saved in the computer.