how do you set your own code on the drivers side door on a 2002 ford explorer

I tried to copy and paste but it's too long. Go to that link and go to Page 121

For some reason when you post links they run off the page. I posted the same thing on another question except I found page 122! lol

Yeah, that has happened to me too. Instead of going to another line they run on and on out the answer window. Oh, well. It starts on 121 but carries on to 122 where the real answer is as a mater of fact, that's true.

on passenger side back of door side panel- remove side pane just enough to get factory number. Then google ford manual or if you have your manual there you will find the procedure to your question.