As the name suggests, extender is a device used to extend the range of your Wi-Fi network. You would require an Ethernet cable to compete Netgear router extender setup. Then, follow the steps as follows. Type mywifi.ext.net in your web browser. Click on search and a login page would be displayed. Now, enter the username and password. If not changed then enter the default credentials. Click on login and select wireless settings. Under the security options, verify your router password. Click on apply and your device would be connected to the extender.