first, find out what port(s) your game is using, try their website, might tell you in the tech help section. then open your dlink config program or web browser config page or what ever they use. then get to the virtual server page. just fill in the blanks. service port is the port number your game is using, the ip address is the local ip of the computer you are playing the game on. then you have to check the enable box.
access-list 1 deny stupid comments
ip access-group 1 in