Murphy's Law...as soon as I posted that question, I re-opened TurboTax and on the Welcome/Home screen (before selecting a tax return), I found the Amend is all the way at the bottom of the screen.
Of course this was further complicated that once I was in a return, I couldn't find how to close that return, to have it get me back to the Welcome/Home screen, without exiting completely, then re-opening.
Thanks for the other method to get to the Amend process!
