Finding and Replacing blanks

If you have a field that is blank, and you want to fill it in with a value, how can you use Find and Replace in order to do this. I have tried it a few times, with a couple of different methods, and have not been able to get it to work. I have tried *, ‘’, and keeping the find field blank.

You keep the “Find What” field blank but make sure the “Replace Whole Field” option is ticked.

Thanks, worked like a charm!