How do II set up http port forwarding on my Xfinity Gateway?

I want to set up port forwarding on my xfinity Gateway to my Apache http server. The admin tool at 10.0.0.1 doesn’t allow it (it says to use the App) and the App doesn’t list http as a “common application.” There is a “Manual Setup” option but I don’t know how to set that up.

Any advice on how to set up port forwarding to my Apache http server?

Thanks,