To complete Linksys Range Extender RE9000 Setup using WPS, you need to connect the extender to a power source close to your router and wait for it to turn on. Next, you need to press the WPS button on your router and wait for two minutes, then press the WPS button on your extender. The LED light will blink green and turn solid green when the connection is successful. If the LED light is blinking orange, you need to repeat the process. Finally, you need to connect your devices to the extended Wi-Fi using the credentials on the product label.