Since the receiver has a bluetooth receiver but not a transmitter you have two options.
1. Use a Yamaha Musicast speaker. That will be compatible with the receiver.
2. Since the receiver doesn't have any line level outputs you can't just connect a bluetooth transmitter to it. You would need speaker selector switch connecting the front output of the receiver to your indoor speakers and also to a speaker to line level converter that would feed a bluetooth transmitter. Kind of a cobbled together way of doing it.