Plutonium

Hello all I would really appreciate some help. I downloaded plutonium so my friends and I can play world at war zombies together. My game won’t allow me to host online so followed the steps on the website and downloaded what I need to host but I don’t know what to do next. I couldn’t find where the website wanted me to put the file and I’m kinda just stuck. I can join other servers but that’s really it. If someone that’s well versed can add me on discord I’d be eternally grateful. Thanks
Discord: TylerMFJames