Talked to customer service at Samsung.
Swipe a capital L on the login screen
This brings up a list of "global options"
Select "pause feedback"
(The selection is tricky because it's in talk back mode. I had to try several versions of double tapping, holding and double tap holding, the last being where you double tap and the second tap is actually a hold)
If successful, you will get a screen to verify you want to get out of talk back mode
Go through the same procedures to get the "ok" button selected
If successful, you can get to the home screen, to settings menu, to accessibility, and to talk back mode and get it TURNED OFF!