Change the wallpaper on iPod touch
On iPod touch, choose an image or photo as wallpaper for the Lock screen or Home screen. You can choose from dynamic and still images.
Change the wallpaper
Go to Settings > Wallpaper > Choose a New Wallpaper.
Do one of the following:
Choose a preset image from a group at the top of the screen (Dynamic, Stills, and so on).
Wallpaper marked with changes appearance when Dark Mode is turned on.
Select one of your own photos (tap an album, then tap the photo).
To reposition your selected image, pinch open to zoom in on it, then drag the image with your finger to move it. Pinch closed to zoom back out.
Tap Set, then choose one of the following:
Set Lock Screen
Set Home Screen