Port Opening

I have a Prestige 600 series DSL/Router modem (according to the box it's both). Well I would like to know how do I open ports? Since some programs need some ports open to operate properly. When I connect to my DSL I have the following tabs:

Home
-Home
-Quick

LAN
-LAN Config
-DHCP Mode
-DHCP Server
-DHCP Relay

WAN
-DSL
-ATM VC
-PPP
-EOA
-IPOA

Bridging
-Bridging
-LAN Config
-DSL
-ATM VC
-RFC 1483 Interface(EoA)

Routing
-IP Route
-IP Addr
-LAN Config
-DSL
-ATM VC
-PPP
-EOA
-IPOA

Services
-NAT
-RIP
-FireWall
-IP Filter
-DNS

Admin
-User Config
-Commit & Reboot
-Image Upgrade
-Alarm
-Diagnostics
-Port Settings

I know the most obvious place to go to would be Port Settings but that is just to configure the normal ports ex: HTTP Port. I'm running Win2k pro although I don't think the OS has anything to do with it since I had the same problem on Win98.

-IP route should be it.
Setup a route that routes all incoming traffic on a particular port to your box.

el-half is probably right. Here is what mine looks like as a reference: