DonlAZ:Thanks, I tried that and as soon as I select Change the option to select a pin goes away in the find window. I'm able to select a pin UNTIL I select change. I must be doing something wrong?
Try this:
Edit-Text
Make sure you have Package Geometry - Pin Number selected for the active Class / Sub Class
Then click on the pin text and type in the new number.
This will work assuming you are editing the footprint .dra file as Steve points out.