I want to make a minecraft server how do i port forward a Actiontec GT704WG gateway router?

Did you click on "Security" icon and find what it shows there? I'm guessing that "View Rule" button should show you which port(s) would be forwarded for each application on the default lists. And I would hope there would be a way to add an application that is either not listed or uses non-standard port(s). Maybe the "User" radio button can do that.