Marcelo Turcios:
Welcome to the forums!
Don't know if I can help you much with this one but I'll tell you what I know. The shifter handle is held in place by 4 bolts and 4 'wrap-on' nuts. If you loosen the bolts be careful NOT to drop them into the gap between the carpet and the metal body (shell). They are hard to retrieve. Also, be careful not to knock off the wrap-on nut off the sheet metal and drop it into the gap between the carpet and the shell. Once the shifter assembly is loose, you may be able to get access to the little bulb. Watch that you don't tear the overdrive wire (it is very thin) as you move the shifter assembly around. When tightening up the four bolts, just go easy and use a criss-cross pattern, tightening each bolt a little at a time. If you overtighten a bolt then you'll strip the wrap-on nut and then you have to undue all of your work.
That's about all I can tell you. I have not had to replace the bulb or my post would be much better, lol.
HTH,
Chris