Hello 3alola1,
In WAN Host Start IP Address you should put your computers IP Address which looks like 192.168.x.x
You can find this by running CMD -> type in the terminal " ipconfig " without quotes, there you will find your computers ip address.
Than for the ports you would open the ports TCP start "7171" end "7171" and TCP start "7172" end "7172" insert them without quotes.
I hope I could help you out.
If you have any questions don't hesitate to ask !
Sincerely,
Ralumbi