Change RDP Port 3389

You want to be able to change your port number from 3389 so you can view more than one PC with remote desktop.

Go to your modem firewall settings

Add a new rule  allow destination ports 3389 - 3390 see picture below.

Now in your Virtual Server / Port Forwarding settings add the PCs you want to port forward.

Now from remote PC enter this into remote desktop (Your wan ip):3390.

 EG: 100.100.100.100:3389 or second PC 100.100.100.100:3390 or third 100.100.100.100:3391.

This will allow the external port 3390 to redirect to port 3389 which has been configured to go to local machine 192.168.2.6