You must first complete the Wavlink WiFi range extender login process before you can complete the Wavlink AC600 configuration process. 

The power LED will begin blinking as soon as the Wavlink AC600 extender power plug is inserted or fixed into the power socket. Connect the computer to the Wavlink WiFi range extender network at this point. Next, open the navigation on your WiFi device and type wifi.wavlink.com into the address box. Finally, complete the Wavlink extender login process by entering all the information that is displayed on the display page. Later, complete the Wavlink AC600 setup by using the directions shown on the device’s display. 

For another setup process, placing the Wavlink AC600 extender next to the current router will work. Push and hold both devices' WiFi-protected setup buttons after that. Finally, see the solid and stable LED on the extender and existing router.