What is Port Forwarding? Check it out here
Your port will forward automatically is your router supports it.
Click the “Add new entry” and then the image above will come out.
Give the port forward a name (BlackShades Server/Testing Port) etc. and then click “Save changes and exit”
Foolproof Tips in Spoiler
Internal IP address will be shown as one of your “destination ip’s” on the mainscreen.
External and internal port should be set as the same number.
All other settings can be left as default.