Follow along with the video below to see how to install our site as a web app on your home screen.
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SourceIf your Android device doesn't appear in Android Device Manager, or if you see Unknown location despite your device being online and running Google Play services version 3.2.25 or higher, follow these steps:
Open Google Settings from your device's apps menu.
Touch Android Device Manager.
Uncheck Allow remote factory reset.
Go to your device's main Settings menu, then touch Apps > All < Google Play services.
Touch Clear Data. Note that this action doesn't remove personal data.
Go back to Google Settings and select Allow remote factory reset.
Restart your device.
you might have to unselect remote factory reset to clear data in Google play services. After clear data the go back in select it again, reboot you should be good to go.
I use Cerberus, it's a great little application.