In the lower right to open its configuration panel. Select Bluetooth PAN in the same Network window, click the Advanced button
(e.g., USB LAN) and note the IP Address, Subnet Mask and Router numbers. Under System Preferences > Network, select the active Internet connection
Make sure your mobile device is paired via Bluetooth and follow Heiko Haller's I ran into the same problem when reverse tethering my Samsung phone (Android 5.1.1) to access the Internet connection on my Macbook Air (El Capitan), and found a successful solution:
