An Ethernet port on the old PC and an Ethernet cable. Does the PC have such port? If so, connect the cable to the port and the router. If the PC does not have said port you can purchase a PCI adapter and plug it into a spare slot on the mother board.
I have a new I-MAC connected to a router from VERIZON. I want to connect my 8 year old DELL computer to the Internet. How do I do this?