2. Then find and click the "wallpaper" or "lock screen and wallpaper" option.

3. Then on the wallpaper setting page, select "Gallery" or "Album", and select the picture you just edited and saved.

4. Secondly, adjust the size and position of the picture to make it fit the mobile phone screen.

5. Finally, click the "Set Wallpaper" or "Apply" button to set the picture as the mobile phone wallpaper.