First THANK YOU to sjpt again for helping me and so many others here. You are invaluable to this forum.
I went to CHAT this morning and the name of the Service rep is Rakesh. He was very helpful once I got across that all I needed was to erase old authorizations because I had reached my max even though I only had 3 devices.
Bottom line, they did not erase the 6 used up authorizations, they increased mine from 6 to 10. So now we know how this works.
Sadly I won't know until Christmas day if I will be able to Authorize a new (3rd Reader/4th Device) eReader. I'm hopeful that I now have room for 4 more devices, need only 1 more, and I just need to remember to de-authorize as I go. For example I'm getting a new computer next year . . . must de-authorize this computer before replacing it. Seems pretty simple once we know how it all works.
NOW for the future, my right hand over heart . . . "I promise to de-authorize all devices and computers when I discard or REPLACE them"
Thanks for all the help