Learn how to lock screen on your Nokia Lumia 928. Select Settings icon > lock screen. You can select which apps show their status on your lock screen.
Tap Settings icon > lock screen > Background.
Tap photo.
Tap change photo
Select a photo, and tap Save icon.
Note:
You can adjust the photo by zooming in and out, or by sliding the photo up or down, and left or right before selecting Save icon.