Zoom on Adroid Phone - Sound

I am taking an exercise class using zoom. I tried accessing on my Android phone today and could not get the sound turned on. I have to deactivate my video and the sound at my end, which is easy to do on Android tablet. But I couldn't figure out how to get the sound on the phone. I know there was sound, because I switched to my tablet. Can anyone just walk me through deactivating my video and my mike, yet retaining the sound from the meeting source? Thank you!