How do I play music using the player attached to the app?

1> Make sure that there are songs in your phone’s play list.

2> Tap the earphone icon on the app homepage or the play key of "bling jet".

Music player
How do I play music using the player attached to the app?
Can I use a third-party music player to play music through the helmet?
Why doesn’t the helmet output sound when I play music on my phone?