Editing text - totally lost

Hi there,

First time here, and hope I can get some help. Totally new to photoshop, and I am trying to edit a date on an old certificate. I have CS4. I scanned the card into a pdf, tried the "find and replace text" command - didn't work. Then saved the file as a .psd file and tried the same thing - same result.

I don't understand the "layers" stuff and don't even know if those matter in this case. Can someone please point me in the right direction.

Thanks a lot!

a picture of text is not editable unless you erase and replace

OK great,

how do I do that?

will if you need to ask your probably better off asking someone to do it (if it's even possible) seeing the image would help decide what way is best