WHAT SHOULD I DO TO FIX MULTIPLAY LAG

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Traffic between you and FRIEND'S_ID is being routed through a relay network. Configured your NAT to forward steamworks P2P networking ports.

본인과 친구아이디 사이의 트래픽은 릴레이 네트워크를 통해 라우팅되고 있습니다. 스팀워크 P2P 네트워킹 포트를 전달하도록 NAT를 구성합니다.

I set using DMZ and open port 27036 and 3074-3075 with port forwarding. I tried https://portforward.com but I can't understand how to do that (because I'm Korean and not good at reading English) PLEASE HELP ME I WANT TO PLAY THIS GAME WITH MY FRIENDS