To select the audio output device on a Macintosh running OS X 10.4.6 or a later version, follow these steps:
Click the Apple menu in the top left corner of the screen
In the Apple menu, click "System Preferences..."
Click the "Sound" icon
Click the "Output" tab and select the Bluetooth® device from the list of available options
Click the "Red" button to close the control panel
Play audio from the computer (iTunes etc.) to initialize the change