To connect your Wavlink WiFi extender to your modem, start by plugging in the extender near your modem. Access the WiFi settings on your device and connect to the default network name (SSID) of the extender. Then, open a web browser and visit wifi.wavlink.com. Follow the on-screen instructions to configure the extender to your modem's network. Once completed, enjoy extended WiFi coverage throughout your home or office.