First, use your own wallpaper.
1, enter Settings >; Desktop and wallpaper > wallpaper.
2. Choose a picture.
3, according to the need to choose:
Blur: Blur the wallpaper. Slide the slider to adjust the blur level.
Scroll: Let the wallpaper slide with the screen.
4. Click √ to select the setting as lock screen, desktop or both.
Second, set the photos in the gallery as wallpaper.
1, enter the gallery and find your favorite picture.
2. click more > set as > wallpaper, and complete the setting according to the screen prompts.