Extender Mode
Make sure the Extend is plugged into a wall outlet and has power (the blue power LED should be solid blue).
Connect the included Ethernet cable between one of the two Ethernet jacks on the Extend and your existing wireless router or switch.
Make sure your mobile device is connected to the wireless network you want to extend. (You can check this in the Settings/Wi-Fi menu of your mobile device)
Launch the HEOS app on your mobile device.
Select the Settings 
icon in the upper left corner of the screen or tap “Setup Now” button at the top of the screen.
icon in the upper left corner of the screen or tap “Setup Now” button at the top of the screen.
Select My Devices -> HEOS Extend -> Mode -> Extender.
Follow the instructions on the screen to complete the configuration.