Android 4.1+ uses the accessability service to read your incoming What App messages. This has to be activated in the system. Since Android 4.3+ the app uses the notification access service which also has to be activated in the system. The settings of this app brings you directly to the correct system settings.
This extension requires the requires the Dashclock Widget by Roman Nurik:
How you can add a widget to lookscreen is described here:
If you dont want an icon in launcher please use the donate version. Many users need a fine instruction for using this application first time and so we added the configuration as an app icon. The visibility of an app icon is not a dynamic settings in android so we need an new app version. Sorry.
Please report errors to our email adress.