Follow these steps to change the Lock screen wallpaper background.
- 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.
- In the Settings screen, in the lower-right corner, click Change PC settings.
- In the PC Settings screen, on the Personalize tab, click Lock screen.
- 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.