Thanks, Mark. I think you've answered the "dumb" question of the day.
Don't know what I was thinking!!
I appreciate your help.
Mark Graesser said:
Betty,
The reason they are grayed out is because there isn't anything to be
undone. If you type into a cell and hit enter the undo button will become
active. And similarly, until you undo something there isn't anything to be
redone.