Disconnect any cables connected to the computer and turn on the modem. Connect the router by plugging one end of an Ethernet cable to the modem and the other to the internet port of the router. For Netgear WNDR4700 Wireless N900 router setup, plug one end of an Ethernet cable to the LAN post of the computer and other to any one of the ports of the router. Plug in the router adapter to an electrical power outlet and switch on the router.