Port-forwarding in router ZTE ZXHN F660: hidden settings

In my company, we have a ZTE ZXHN F660 router, and we need to do a port-forwarding to access a DB allocated in one of our machines through public IP.

We have login into router admin page (visit public ip and login with our user and pass), but our telecom provider seem to be hidden the port-forwarding settings. We just find a few info and settings such as change network name and pass, or disconnect the devices connected to the network.

Is it possible to access the port forwarding of the router another way?

Thanks a lot.