You dont need to fix it, all its telling you is that the router you have does have UPnP, or doesnt have it enabled. All UPnP does is make it so you dont have to do the port forwarding, although it rarely has ever worked for me. As long and you got pass on everything else you're fine.
On another note, has anyone else had problems with BO2? Everything is set up correct and I can see games listed most of the time, but anytime I click A to join it crashes and says fatal error intercepted. I've tried 2 difference copies and also tried every TU lol.