This was discussed in another thread and a how to was requested so here goes.
First thing is to locate and remove the two housing screws that hold the lens in.
Next pivot the lens housing up until you can easily remove it from the bucket.
Do not try and pull it straight out because there is a tab at the top that needs to be disengaged before removal.
Now you need to squeeze the plug to disengage from the bulb. Do not yank as you can break the plug.
Now the housing will be free from the bike and you can see the rubber boot to keep out the moisture (note the "TOP" on it).
Next remove the boot.
Next push down on the right side of the clip and push up to disengage it from the latch.
Now you can remove the bulb from the lens.
If your old bulb is good DO NOT TOUCH THE GLASS as this will put your finger oils on it and if the need arises that you need to reinstall it the life will be very short.
Installation is the reverse of removal. Just be careful when you remount the lens into the housing as the tab may fight you just a bit, and watch out for the harness as well so you don't pinch it when you close up.