I cross posted this.

Go to a cell you wish to format and in the menu bar select Data, then Data Validation.

In the Settings tab, under Allow, select List and check "Ignore Blank" and "In-cell Dropdown". Under Source, enter Y,N. Select OK.

In the Input Message tab, check "Show input message when cell is selected", then enter a title and message you want the user to see when the cell is selected to prompt selection of yes or no. Select OK.

Copy the formatted cell as/where needed.

It worked like a charm, Javachik. Thank you so very, very much. I knew the key was Data Validation, but just couldn't figure out what to do. I am savings this jewel of information for later use. Again, thank you.

FYI, on the crosspost, anne_ct stated that she had found some self-adhesive letters at Staples that are small enough to stick on key faces. I am going to look for and try those before purchasing another keyboard, because I really like the keyboard I am using. I thought her idea was an absolutely great one. I realize keyboards aren't expensive at all, but this solution will let me continue with the one I like. Thanks for your thoughts.

Those ergonomic ones are the best out there and they've come down quite a bit in price from 4-5 years ago. If that is the board you're used to, I'd just get a new one. It's my favorite board too and I'm on my 2nd or 3rd one. :c)

To get a keyboard with long lasting lettering, choose one whose keys have the nomenclature molded in as a depressions on the key tops. After molding, these depressions are "ink filled" and are resistant to wipe-off. If some of the ink gets lifted, these can be refilled, Sadly, most keyboards available today have smooth top keys with the lettering printed on, most likely with an ink jet printer. This is a cost reduction because most of the keys are physically the same with different printed characters. The ink eventually gets worn off on the most used keys. On my keyboard, its the "a, s, and e" keys.