Make certain that the power supply is turned on before beginning the process of the Linksys RE6500 Setup. After that, you should join the networks of the extender. From either the mobile device or the desktop computer. You can also accomplish this by enabling the WiFi settings and selecting the network name SSID that you want to use. Simply launching a web browser will allow you to quickly locate the IP address. After entering the IP address in the browser, you will be taken to the page where you can log in. The final step in getting everything set up correctly is for you to input the username and password into the corresponding spaces in the URL. Which can be found either in the user guide or on the label of the device.