replacing the "marker light" in the light assembly
 

That might be the stupid question of the day, but I can't figure out how to get to the little light bulb in the light assembly.
Yes I know I need to pop the whole headlight assembly out but then, where is it?

Well the first question is what light assembly are you talking about
 

and what light bulb doesn't work and needs replacing?

Most light bulb replacements are covered in the owner's manual. Even a klutz like me has done em. But the low beams are the higher bulb and the high beams are the lower and that isn't immediately obvious.

Pop out the whole assembly then pop the cover off the back. The marker light is the “third light” between the much larger high and low beams. There are three wires leading to a little plug. Just grab the plug and pull it out.
I just changed these lamps out on mine with LEDs to better match my HIDs.
Disclaimer… These instructions are based on my best recollection and maybe subject to error.

It's the little one right below the litronic bulb. You just pull the wire and the bulb assembly holding the marker light will come out. Yes reading the manual helps. ;)

got it, I will RTFM :D