It used to be my mum's, it's a 4-year-old Nokia C3-01 touch-and-type phone. She could never fugure out how to change the normal background but I worked out how to do that when I was given it. I can't find the settings for lock screen, apart from PIN, which is locked when my mum bought the phone because she asked the shop to do it for her. Please help.

Read more: How to change the lock screen on my phone? It's an old phone though?