If you can get the song in an audio file you can open on your iOS device, you should be able to share it to walkout song DJ which will put it in the imported file folder of the app where you can pick it for a player.
Getting a video from YouTube to a song file format is pretty tricky on iOS device, but if you have access to an Android device or a windows pc where you could install the Android emulator called Bluestacks... the you could use the simple song collector that we provide a link for on this thread:
https://upallnitesoftware.com/forum/index.php?topic=246.0