Tap on the background button and a list of options should appear.
1. If you want to add your own background except the in-built one, tap on “+”.
2. By tapping on “Import” you can import images from your device album to be used as backgrounds.
3. I you want to make your own background, tap on “Create” and then it will appear on the list. Tap on it and edit it.
4. You can choose your customized background or a default one.