 Select Bluetooth, Connections, and select Discoverable. From there in your iPhone or Android device, you can go into the Bluetooth settings, look for MSRA770 or MSRA670 based on the model, and from there you should connect and be good to go. So once your phone is connected to the head unit, you can then control each zone independently of each other or altogether with your phone. To do so, so they come up to your head unit, select Settings, Zone, Phone Volume Sync, and now we'll give you options of Bow, Hardtop, Aft, and Tower if equipped. From there you can choose which zone you would like to control with your phone.