In order to do the orbi setup with existing router, unplug your modem and, if it has one, remove and replace the backup battery. Reconnect the modem. Using the provided Ethernet cable, connect your modem to the yellow Internet port on your Orbi router. Connect the power supply to your Orbi router. Press the Power On/Off button if the Power LED on the back of the Orbi router does not light up. If you want more information on orbi setup with existing router, visit our site.