Hi Mike,
Tiffany’s given you great instructions for editing your scheduled Fills in the reply above. If you’re instead looking to see if there’s a better way to edit your Quick Fills as in the ones you can save with preloaded Fill options for later use, there is not a way to edit those, and if you want to make any adjustments, you’ll have to either do what you did and delete and recreate, or otherwise deploy the old one and make the slight changes you’re looking for.