2. Secondly, open the picture, and then click "Set as wallpaper" or similar options, and the picture will be set as the background of the mobile phone screen.
3. Finally, if you want to use Pu Xian's picture as the lock screen wallpaper, you can find the "lock screen and security" option in the phone settings, select "Change the lock screen wallpaper" after entering, and then select the Pu Xian picture you just set.