To perform a linksys wifi extender login, start by connecting your device to the extender's network. Open a web browser and enter "linksys wifi extender login" or the default IP address, typically "192.168.1.1". This will direct you to the Linksys extender's login page. Enter the default username and password, usually 'admin' for both, unless previously changed. Once logged in, you can configure your settings to extend your wireless network's range and performance. If you encounter any issues during the Linksys WiFi extender login process, consult the user manual or reach out for technical support through the manufacturer's website.