
Under System preferences > Bluetooth devices, you will see an entry for your Bad Elf
After selecting your elf, select the Settings Icon beneath the list of Bluetooth devices paired to your Mac. You will see the following pop-up menu appear at the bottom of that window select Edit Serial Ports...
You will see the following screen and the name assigned to this connection will be listed beside Path: at the bottom. Note this and it will be used in your chosen application to make the connection with your elf.