How to change the light bulb inside the gear selector ?

Remove the console and then remove the bezel from the shift lever. You may not have to do this if you can see the bulb plug without removal of the bezel.

This is just a guess on my part, but you probably have to remove the console cover. If you have a storage box under an armrest, look for screws in the storage box, behind the ashtray in the back, and the front of the console.

I had to do this when I got my car.....hope you have a kid with small fingers.

Would you mind telling me how did you do it ? I un-screw the two screws at the front part of the rear console but still could not remove the thing, there seems to be something attaching the rear of the rear console but I couldn't find and screws anywhere.....

you have a kid with small

If there is a storage compartment in the console, look in the storage compartment for screws. If there is an ashtray that opens for the back seat, remove it and look in the ashtray opening for screws.

There are two screws at the bottom of the storage compartment, and, at least in cars from the 80's, you pull the seats forward to gain access to two screws on the sides of the console.