Can't access E6200

I did the factory reset and everything proceeded ok using my laptop, especially once I realized that I had mistyped in setting a password. Then things went downhill, as the multiple username and password settings with 2.4G and 5G in Netgear are seriously confusing. I write them down, but It's impossible to tell from the settings screens where the username and/or passwords apply. Then one minute there's 5G connectivity to the Netgear. Then another, I reset passwords and it shows me successfully connected to the existing WiFi network, but the 5G password has disappeared! And on the next I've completely lost my main router connection and it wants a guest password (there isn't one, never used it). And now I've completely lost my cable internet connection. 

So, power cycles and reboots later, my main computer is back up everything works...except connecting the laptop to the Netgear. Not one password recognized and thus mywifiext.net page shows I'm not connected to the extender's wifi network. Perhaps I need to start with reset again?