The background image for your device, also known as the wallpaper, can be changed in settings. You can use your own image as a wallpaper or choose from the default images on your device. You can change the lock screen and home screen backgrounds.
From the Home screen, touch and hold an empty space.
Tap Styles & Wallpapers.
Note: For this tutorial, we're selecting static wallpapers. Live wallpapers move on their own and add motion to your Home screen. You can also select one of your own images from the Gallery app.
Scroll to a Wallpaper category.
Select a Wallpaper category.
Select the wallpaper you'd like to use.
Tap Set Wallpaper.
Tap Home screen and lock screen.
Note: For this tutorial, we're changing the wallpaper on the home screen and the lock screen. You can also change the wallpaper on the Lock screen.