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if you don't know how it's done, you should search for video guides explaing required steps, depending on your router's brand & model. it's recommended to do for CoD zombie games, especially for the person who is going to host co-op matches. if you cannot access to router interface due to not knowing its password, you may search on Google for alternate ways, like doing it via windows firewall settings.
if you want to learn ports used by PC version of Black Ops 3, you can check this activision support link which lists them (including lots of other CoD titles).
https://support.activision.com/articles/ports-used-for-call-of-duty-games
port forwarding is worth a try only if you have a strict NAT (in most cases, moderate NAT would still be OK), or if you've tried literally everything else and couldn't find a solution yet.