How do I remove the head light cover to change bulbs and what could be wrong?

Hello, Attempting to remove the headlight lens will likely result in permanent damage, and necessitate replacement of the headlight assembly. The bulbs are replaced from the back of the headlight assembly, and normally they unscrew. If the lights are coming on, and failing, I recommend seeking diagnostics before buying bulbs, as that may not correct the issue. Are these HID lights, or regular bulbs?