#1 → Run CMD (If you don't know where it is search it in your computer).
#2 → Write “ipconfig”,it will give you this(I censored my details) : ]
#3 → Copy your Default Gateway's IP and paste it to your browser,then write the following detailes Username : Admin / root / [root] / Administrator Password : admin OR Admin / root / [root] / Administrator this is what you will get(It will be designed different,if you have D-LINK it will be designed like mine)
#4 → Go to Advance > Port Forwarding / Find your Port forwarding in yours
#5 → This is what you will get
Press “Add” now.
#6 → Put it on Custom Service,then add your IP address (You can find it here : https://whatismyipaddress.com/)
#7 → Add the ports to your router Example :
External Port Start External Port End Protocol Internal Port Start Internal Port End 7700 7780 TCP/UDP 7700 7800