We need to know the model of your router. It should have come with a CD that has a detailed manual & you can probably find that information there also.
I'm trying to enable UPNP on westell router. It want let me see my security DVR on the computer.
I believe it's enabled by default.
The only place I know that does anything with upnp is logon to router
From what's there the only thing that makes sense is to check Allow other network users to control router networking