I would like to know how to install replacement lightbulbs

It is just a small spot light. Take the old bulb to your local hardware store. They will have a replacement.

Remove the key from the ignition. Make sure the doors are closed, so the new bulb does not illuminate when you are installing it.
Make sure the dome lighting switch is turned to the "Off" position. Pry the plastic lens away from the dome light. Use a small, flat-head screwdriver.
Push back the side bulb clamp. Pull out the old dome lightbulb. Wipe the area with a paper towel if it is dirty.
Wrap the new bulb in a paper towel. Insert it into the dome lightbulb holder. Push it up gently to secure it.
Turn the switch to "On" to test the bulb. Reposition the cover and push up to lock the clips into place.

Turn off the fan before you climbing the ladder to remove the dead bulbs

Note whether a screw secures the shade or if the lightbulb holds the shade in place.Unscrew the lightbulb counterclockwise. If the bulb is securing the shade, grasp the shade with one hand while removing the bulb.Install the new lightbulb by turning clockwise into the socket. If the bulb holds the shade in place, keep the shade in position with one had while screwing in the bulb with the other.

ceiling light

With the overhead console ( non rail system ), open the sun glass bin, and grab each corner in the back, and pull down.

The overhead is held on with 4 or 6 spring clips, and pulls straight down.

The bulbs are 1/4 twist sockets installed from the back of the overhead console.

Go to your local car stereo installation shop and ask them NICELY to look at it for you...$30-50 at the most...maybe free, if it is buy the dude lunch for what, $10?
Good Luck

Turn it!!!!

Hiya...
When this happens, it means one or two of the halogen headlight bulb(s) has been burnt-out.
Do this quick and easy self-test:
Turn on the headlight switch to LOW and see if you see one (or none) turns on...you'll know one or two lightbulb(s) need to be replaced....this is why the green headlight logo flashed to tell you that a bulb has just burnt-out.
You'll need to remove the 4 black plastic clips that holds the top grille bracket frame onto the top metal frame that's facing the top radiator area.
If you know which headlight's bulb need replacing, just remove the 3 bolts...two are on top and one is by the side (close to radiator area)
Then you pull the grille toward you gently to allow your hand to access behind the grille and headlight area to reach the white socket that's connected to the headlight bulb.
This requires some patient as it's a tight area for your fingers to wiggle the socket off.
When the new lightbulb is installed, the green headlight logo will appear in the instrument panel when you start the engine.
That'll help!

Chris, I googled and found this
http://www.plasmaled.com/household_led_light_bulb.htm

probably available at a lightbulbs unlimited or other lightbulb store.
Maybe even a Home Depot or Lowes.

take out screwws on light remove bad lightbulb then replace lightbulb

it screws off, make sure you replace it with an appliance bulb.