Yep the D-Link routers don't use UPnP unfortunately & do have NAT firewalls. I have one myself.
Remember you need to do it using these steps:

1. Set up a static ip 1st. This is the most important step otherwise you'd be wasting your time if not done or done correctly. Pay attention to this b/c this is where most people make errors if mistakes are made.
2. Forward a port.
3. Finally, within LW: Manual port forward instructions & sample image & 2 posts after that.