1. Run the season generator to generate any year
2. Open the file (it will show all the players, etc.) in the "nfl 2k5 controller" part of History and open the file you just generated.
3. Start up Finns editor,
4. Open an existing roster in it
5. Be sure your roster is on San Fran's team
6. Click "go" in the controller (at bottom) and let it run.
If you have the editor on top, you'll see it run through the players and change them one by one and you'll marvel at how fast it is compared to how slow you are at doing it by hand
7. Save and you're ready to go. Don't do any computing while it's running or it could mess up or stop.
Hope that helps some.