Accessing the router/modem
Open your web browser and go to the address http://192.168.0.1
When prompted for a password, enter:
Once logged in, the modem will automatically check for new firmware updates. When complete click on the advanced tab at the top of the screen.
Click on Advanced Setup next.
Click on Port Forwarding/Port Triggering.
Click on Add Custom Service.
Set the Service Name, choose the service type (TCP, UDP, or Both), and add your ports. If you only need one port opened, simply add the same number as both the starting and ending ports.