I've been handling networking for over a decade, so I have plenty of experience with routers/etc.
From what I'm gathering, you're using a DS lite on a wireless connection, which is provided by a router connected to a modem or built-in to your modem.
In order to open your ports, we will need the password for the router and possibly for the modem.
With that in hand, I can open and forward a port to your DS lite.