Audio source

Just bought a 2nd Prius - V, I think. I can't find how to add that to my profile.
My problem will take a sentence or two of background. Since having my phone connected to my car, the call feature works perfectly. For the months I've had the car, the audio has worked perfectly . . . until 2 days ago. Now, when I get in and start my car, the music starts automatically. I don't want that. I want it to start only when I start it from my phone.
I can connect my phone to the car and let the car have control (I forget the lingo), but when I try to change it to connect from my phone, it fails. How do I connect from my phone? I don't want music to start every time I turn on the ignition.

 

Bluetooth. Sorry, I forgot that part.

 

Well, I've learned a little.
First, I've found, when music starts playing, I can turn off the audio in the Prius and the music stops. Insure audio is off, turn off ignition, wait 1 hour, get in car, turn on ignition, audio starts. Somehow, the audio in the Prius comes on when I start the ignition, even when the audio was off when the engine stopped.
Second, this behavior is consistent over 3 cells - my Android, my wife's iphone, my son's android. Whichever phone is close when the ignition is turned on is the one that plays music automatically.
Thus, I suspect the problem is in the Prius. Initially, I was able to find a 'let phome control audio' and 'let car control audio,' but can't find it now. Could that be it?

 

OK, followup. Where is it? Can't find it now.

 

Unfortunately, it's a 2016 v. As noted in the original post, can't find how to add a 2nd Prius to my profile. Tried Setup>Audio as Air_Boss suggested. I'll try Audio>Source.