The extender must have previously connected to your router and obtained a valid IP address. To set up a new extender, see How do I set up my NETGEAR WiFi Range Extender?. To reconnect your NETGEAR MyWiFiext range extender via Ethernet: Connect your www.mywifiext.net range extender to your computer with an Ethernet cable. Launch a web browser on your computer. If you face any issues so you can call toll free -(888) 807-2111.