Installed a2dp, now can't connect plantronics headphone

I'm going to be the first to admit that I don't know what I'm doing. I just purchased a Plantronics M70 and successfully paired it to my Samsung G6. I then downloaded a A2dp app and apparently changed a setting I shouldn't have. I uninstalled the app and rebooted the phone and fortunately it recognized and connected to the headset. I would like to run A2DP but it disables the headset. I don't really want to blindly change settings that I'll never remember I changed and disable my headset again. What's the trick to get A2DP to work? Thanks