¤ Firstly,  go to the "3 points" to search the settings button 

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¤ Then, choose the settings button (configuración)

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¤ Go to background playback and switch, if you don't have it activated

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¤ Now, open the post with the song that you want to play, and push the "youtube" button to open it in other window.

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¤ You can play this song in the new window and go back to BBS, make a comment on that post ✅ and keep navigating 

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Now you can keep navigating and listening the song that your friend shared with you 🤩