Hello from Croatia

I’m new here, just bought volumio primo. I’ve never met with volumio software before, so I’m still learning about all options. I red some of topics here, faq, etc and have some questions. I’m using volumio app for Android, and have latest volumio installed on primo. First, for volumio primo, when you shut down primo with volumio app, how do you turn later the primo on? Tried, YouTube app, should read code in settings, but there is no code it’s blank? And, when I’m using volumio Android app help, there is no way to go back to volumio home screen it’s stuck in help screen, doesn’t respond to back button on my tablet?