To be useful, My WiFi should mirror your router admin page but it could be limited to whoever designed it. It's someone's interpretation of what you should see.
These network services, ports and protocols have been around a long time. If you had a router in the 90's...as Mouth indicated above...you could configure it for remote administration via its Public IP Address, such as from wherever you work. You can still do that today.
You don't need Cox to do it and it shouldn't cost $10 a month. Cox just tossed it on their page and are forcing you to rent a modem to use it. It's a scam.