Port Forwarding - Through Ethernet port 1 - Not showing connected - XB7

My computer  is connected to Ethernet Port 1 on my XB7

When attempting to port forward for this computer I cant because of this dumbed down interface.

you get this message on the xfinity gateway login

"Managing your home network settings is now easier than ever.
Visit xfinity.com/myxfi to set up port forwards, among many other features and settings."

Useless.

When you go to the link and get to the port forwarding section. its not listed because for god knows what reason.

it shows it as a "DEVICE NOT CONNECTED" over 3 months ago.

and since they dumbed it down so much. you cant even manually setup with a static IP Address

you can only select a device to port forward.

even manually adding the mac address and computer as known devices. its still not able to select it from the list because its still a "Device not connected".