I'm trying to configure port forwarding on my CNet router for a locally hosted HTTP server. The model number of my router is CQR-981 and the firmware version is 1.0.43.

The problem is that there's no field to enter the private port of the HTTP server (the local port). According to the manual there should be one.

Here's a picture of the manual:

Here's a screenshot of my router page for port forwarding (with no field for private port):

Is there some way I can circumvent this problem. Perhaps manually make an HTTP request to the HTTP server on the router to update the table with the private port number, or perhaps update my firmware to solve this problem.