iPhoto picture info

I need to know how to change the info for a specific photo in iPhoto. When I scanned the photo into iPhoto on my Mac I clicked on "info" and typed in what I thought at the time was correct info. I now know that the info is wrong but I can't find a way to edit it. I've found online articles on how to change the metadata, but that's not what I want to change. I can change the title for the photo, but I can't change the info I typed in below it. Can anyone help me?