Required Parts
Soldering
Solder two wires to the BAT terminals on your bluetooth module.
Schematic
Hook up and Test
Your circuit should be turned off.
Make sure you have an audio cable.
The audio will play from the Bluetooth connection, through the cable into the main circuit.
Power on your circuit and look for a BLUE LIGHT on the Bluetooth board. If you don't have a blue light, turn the circuit off ASAP and check your connections.
Once you see the Blue Light, open the Bluetooth preferences on your phone and look for a device like "VHM-314" or "BT5.0-Audio" to connect. Note that if multiple people in the same room are connecting, it's easy to cross-connect!
You should be able to play your music using Bluetooth!