Connect Me!.
Your question presupposes that you have subscribed to cable internet service, and that the provider has run a cable to your home. It also presupposes that you have a cable modem.
If...
An answer....
You can connect two routers to a cable modem. If your cable modem has only one LAN port, then plug the cable modem into the WAN port of the 1st router. Plug the WAN port of the 2nd...
You purchase a router and connect it to the cable modem and then connect everything to the router. Otherwise you have to unplug whatever is connected to the cable modem (for example a PC) and plug in...
You can not connect a DSL modem/Router to a Cable modem the are two completely different devices. Basically one speaks English the other speaks Mandarin and neither has Rosetta Stone.