I need to open ports so my game can access the internet

Make sure at first your windows firewall (or other)allows traffic for dragon age. Second each router has a web interface, run 'ipconfig' command from the command prompt (run button -> cmd, then use the gateway address and put that into your web browser. Every router is different, but usually there is a security tab for tunneling. You'll want to set your PC to a static IP like 192.168.1.2 and tunnel those ports to the PC. If you dont, then when the DHCP releases the IP address your PC could end up with some other IP addr then the router wont work.