You will only need to port foward if you connect to the internet through a router, (you're aren't plugged in to a phoneline) try the url address 192.168.1.1 in your web browser it is the default for linksys routers. the go to apps/gaming and enter the port info and your mac's LAN ip. if you don't know your mac's ip go to the status tab, local nework subsection, and open the DHCP clientss table. Find the name of your mac something like (bob's macbook) and put the ip next to it something like (192.168.1.104) back in the port fowarding place.