Configuration fails

the plugin got better, tried one year ago and never worked, even with support. Now implemented within wordpress, but the process get stuck. First step for dummies is easy, thats why some people are happy for nothing. Testing on different platforms got confusing results… WP-Plugin shows outdated help and description… Log in to your OneSignal account, and navigate to the?App Settings?page of the app you configured in this guide. Platforms OneSignal looks totally different so does not help at all