Remove the 2 screws that hold the plastic lens, pull out burned bulb, push in new one (#168 or #194), verify if working, reinstall lens.....
how to replace the headlight
Unscrew the lens, replace the bulb, and put the lens back on.
The headlights are sealed units, unfortunately they do cloud over a bit with age. Try a cut and polish on the outside of the lens to clean them up a bit, but you would have to go to a plastic welder or similar to get them to remove the housing, and even then, cleaning them may not remove the cloudy effect.
eBay has plenty. two screws holding lens in.
You should be able to purchase a CCTV security lens where your friend purchased the security camera. Supposedly it is relatively easy to replace by the camera lens yourself.
I assume you mean HEADLIGHT LENS.. .. there are 3 bolts on the back, remove, pull out headlight. Remove clips and broken lens. Replace gasket, lens and put on clips FRONT TO BACK so you don't chip the lens. Reinstall with 3 bolts on back.
Remove the dome light lens, pull the old bulb out, and replace with new bulb; replace the lens.
The lens can not be replaced alone, you have to replace the whole head lamp assembly
You must replace entire assembly. If your problem is just foggy lenses, you can get lens cleaning solution at auto parts store.
If you mean the 3rd brake light, it has a couple of screws to be removed to get the cover off allowing access to the bulb. If you're talking about the multifunction (brake/signal/parking) lights, it's similar. You'll have to remove the whole lens assembly. Be careful with it, cause you don't want to damage that lens assembly, they're ridiculously expensive to replace.
If you're talking about the headlight, the "lens cover" is not a separate part, you need to replace the whole headlight assembly.