To connect your Netgear router to a Spectrum modem, turn off both devices. Use an Ethernet cable to connect the modem's LAN port to the router's WAN/Internet port. Turn on the modem first, then the router. To access the Netgear router login page, enter routerlogin.net into a web browser and follow the setup process to customize your internet settings. If your connection isn't working, restart both devices and make sure the modem is activated on Spectrum. Updating the firmware and cloning the MAC address could also help. This method ensures a smooth process when you connect Netgear router to Spectrum modem for a stable and fast internet connection.