First, make sure that your AirPods or other Bluetooth device is paired using the Bluetooth pane in System Settings or System Preferences.
To begin using a Bluetooth device with ToothFairy, click the + button in the Settings window. This will open the Bluetooth selector:
Click on the desired device and then click Select. Now your device will appear in the list at the left side of ToothFairy’s settings:
Manually Adding a Device
In rare cases, macOS may incorrectly show the Select button as disabled, but you can add the device to ToothFairy by manually entering its Bluetooth address:
Devices added in this way may have limited functionality; the device name and battery status may not be available to ToothFairy.