AhmedMagdy click on New Port Mapping and fill in the info
https://plutonium.pw/docs/custom-games/#how-to-port-forward
https://plutonium.pw/docs/server/t6/setting-up-a-server/#port-forwarding
If you host at home take your time to read this https://plutonium.pw/docs/server/t6/setting-up-a-server/#why-cant-i-find-my-server-hosted-at-home-while-others-can and https://plutonium.pw/docs/server/t6/setting-up-a-server/#i-cant-open-my-game-while-my-server-is-running