I don't see that particular one listed at
www.portforward.com which leaves 3 options:
1) look at a similar model there, the netgear web configuration pages don't vary that much, one of them will almost certainly be similar enough to get you through the process
2) read the documentation that came with the router (usually a .pdf file on the accompanying cd) to see how to forward a tcp and udp port to your computer.
3) try the beta 3.1 patch, which may do it automatically, & if not you've only lost a couple of minutes installing it, there is an annoying small bug if you use open nap networks with the beta, in which case, look at the first two options, if not it's well worth a shot, the beta can be downloaded
here*edit direct link to file edited to winmxgroup front page (file no longer available) BB