I have both R8500 and Nighthawk Mesh - How do I get to the UI of the Mesh router via browser???

So I've moved into a house much larger than my old apartment and started adding a bunch of ip cams, smart switches, and smart plugs and my Nighthawk R8500 just wasn't cutting it anymore, dropping connections and needed hard resets all the time. To solve this, I bought a Nighthawk Mesh WiFi 6 system.

The Nighthawk Mesh router connects through a switch to the main router (the R8500) which has the default ip 192.168.1.1 for configuration. I completely turned off the Wifi on the R8500 letting it handle all the hard-lines and am now letting the Mesh do all the wireless lifting.

I want to be able to configure the Mesh via browser because I'm not too fond of the app.

192.168.1.1 only takes me to the R8500. In the app, in the router settings>Router Information my ip is 10.0.0.1 but when I throw that in a browser, there's nothing. Under router settings>Internet Port my external ip is 192.168.1.79 but that also leads me to nowhere, am I missing a port that needs to be tacked onto that address? My gateway ip is 192.168.1.1 and so is my DNS Server.