Well that's just weird because the only 35202 I could find is a BRM... not a BRG
Like I said before, there just isn't much info about those at all & certainly not enough to give you any instructions for port forwarding. Did a manual come with the thing?? Is there a switch anywhere for UPnP? If you can find a UPnP switch then turn it on & choose 'use UPnP' within LW's options > advanced > firewall config, then apply.
Did you get the router from your ISP? If they sold it to you then they should be able to help you out with any problems. I'm really sorry but I can't tell you much more! Hope you can sort it out