To avoid the interruption during the setup process a user is recommended to connect their range extender through an Ethernet cable using the wired connection. You need to use the default Wireless credentials when the first time you connect your range extender to the computer. After a successful connection process, you can visit the web interface of the Tp-link range extender using the tplinkrepeater.net link on the web address of your browser.
https://setup-tplinkrepeater.net