Need Help with Port Forwarding

My Router has these settings:
1)Dynamic IP
2)Static IP

Now currently 4 is selected.

The router shows:
IP address: 10.x.x.x
Gateway: 104.x.x.x
LAN IP: 192.168.x.x

But when I enable port forwarding for my local LAN machine (192.168.x.x) through some port yyyy. I can only make use of this IP address 10.x.x.x but not the gateway IP 104.x.x.x which looks like the public IP.

So how can I port forward my public IP across the Internet ?

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