How do you even use this app? – VoiceShare Review

I was gifted a soundbub and downloaded the VoiceShare app to go with it, but I cannot figure out how to use it and there is no instruction. The instructions included with the soundbub are just for the device and there is a promo code included, but I don’t even see anywhere in the app to enter it. It asked to sync with my Apple Music, but I can’t figure out how to add songs to a playlist. Are there directions anywhere online that I am missing?
Review by Frustone1 on VoiceShare.