How can I activate the Background App Refresh?

If the Background App Refresh cannot be activated, you first have to activate it for the device in general.

1. Open your device settings and select ‘General’
2. Select ‘Background App Refresh’ further down in the list
3. Select ‘Background App Refresh’ again and set it to ‘Wi-Fi & Mobile Data’
4. Finally you can go back and enable the Background App Refresh for ‘The Mantrailing App’