Administrator is managed by Parental Controls

And thx Eric Root. Speaking of roots... The "test account" I had created years ago, I had since lost place of the password for.

Since I no longer had access to any admin account, it became a root issue. My El Capitan OS wouldn't let me in to read/write terminal controls from safe mode as a single user and Recovery mode kept hanging. I was forced to do the whole thing through StartUp mode, then Safe with some other dinking. Was ultimately able to set up a new admin, (for which I will safeguard the id and password) and go into the old home account to uncheck the Parental Controls on it. Home account now accessible.

I couldn't access anything other than Apple Forums via Firefox (Parental Controls), so I tried Tor browser and I could get through to the internet with no fuss. Thanks to general forums outside of Apple, after two days I found info on how to do this. I finally re-enabled System Integrity.

All set, and am proud to say, I managed to get the job done. Even though I have years of experience with Mac, it wasn't a job for the faint-hearted. THANKS TO ALL FORUMS!

Thx Allen A. It was not a simple problem to resolve. Since I was in my home admin account when, when I checked the Parental Control box, it ended up managing the home account. Shouldn't have had that effect.