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.
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    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.
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    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.
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    6. Next, choose the wallpaper or image you’d like to set as the background, and tap on Set wallpaper.
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    7. Return back to home screen, and your background should have changed.
You have successfully changed the background!