Be sure to select the latest official version of the app and launch it afterward. You can now go to the Wavlink AC600 setup portal by logging into the window by inputting the default username and password. The next step is to select the network from the available list and input the network password and click on the extend button. Congratulations, you should see the Extend Successfully... https://wavlinkwiifi.com/wavlink-ac600-extender-setup/