Follow the steps below to add the picture to your photos and then apply to background and/or lock screen.
How to Add Picture as Background and/or Lock Screen
1. Press and hold the picture below. Choose save when prompted.
2. Press the iPhone/iPad physical home button to go back to the home screen. Select the Photos icon.
3. Select the photo that you just saved and choose “Use as Wallpaper.”
4. Select “Set Both” to add image as background and lock screen.