If you are using Irfanview follow the instructions below to edit the author field:

1) Open a picture in the program
2) Click on the word Image on the top menu
3) Select the word Information
4) It will come up with a box containing information produced by your camera when you took the shot. On the bottom there is a box entitled IPTC info click that
5) The dialog box that appears now is where you would enter the information that you want to attach to the file. Copyright info, keywords, etc.


Hope that helps.

-Sarah