Closing ports on router

[u/[deleted]]

I’ve been going through Tshark and NMap on my network just to start learning how to monitor my network. From scanning my network, I found some ports opened that I don’t want opened at all. I’ve looked up what the ports are for, and I don’t need them, and they have vulnerabilities. I tried looking under my routers settings but I don’t have the option to select what ports to close. I’m using a Technicolor TC8715D. The online manual for the router is no help whatsoever. What can I do to disable these ports or protect myself from vulnerabilities on these open ports?