http://laudeman.com/Volkswagen/index.html has a great step by step on how to do it.
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Take the light assy off.
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Look in the trunk, there is a cover over the light assembly - open and you will have access to change the light.
How do you change the tail light on a 2001 toyota sequoia
how to change tail light bulb on Toyota sequoia
To change the brake light bulb in a 2003 Alero, first, open the trunk and locate the tail light assembly. Remove the screws or clips securing the tail light, then gently pull the assembly out. Twist the bulb socket counterclockwise to remove it, replace the old bulb with a new one, and reassemble by reversing the steps. Ensure the new bulb is securely in place before closing the tail light assembly.
You will have to get in the trunk pull a couple clips off that hold the carpet over the back side of you tail lights. There are 3 nuts that hold the light assembly to the car. Unscrew those and then the tail light will come out ( you have to kind of angle it). There are bulbs you will have to twist the wiring clips for the out of the tail light.
on the tail light problem - unbolt the tail light from inside th truck -the hold tail light assemble will come out - it is recommended to change all the blubs your all ready there
I have 1999 open the trunk find the hole and wires were the lights are turn the socket and pull the light out
Remove carpet inside trunk that covers tail ligh assembly, then unbolt tail light assembly, remove the assembly and bulb fixture of the bulb you want to replace, replace bulb and re-install in reverse order.
I have a 2003 Outlander and tail light is similar- check out the WikiAnswer for the 2003 which helped me remove my tail light assembly.