I'm new. I have a unrooted S5 Active. I have PowerAmp as a player app

[AC Question]

I'm new. I have a unrooted S5 Active. I have PowerAmp as a player app. I want to make it the deault player across the phone. In app manager the default selection is un selectable.I would like it to be the default for I heart radio..Is there a way to make this connection with the phone being un rooted, I would like that player to work for all audio as well.