You can change the background from the device itself, using the following steps:
    1. Launch MobiLock Pro on your device.
    2. Go to menu, on the upper right hand corner, as shown below, and click on Settings.
    3. Enter your Passcode, to know more about passcode refer to Passcode help.
    4. You will see a list of settings, select Change Background, as shown below.
    5. Depending on the device you’re using, you might be asked to select where to choose the background from,
    as shown below, select one.
    6. Next, choose the wallpaper or image you’d like to set as the background, and tap on Set wallpaper.
    7. Return back to home screen, and your background should have changed.
You have successfully changed the background!