I replaced the amber bulbs with white bulbs in my sidemarker. I watched videos of having to pull to the right then snap off...well that did NOT work so here is what I did and it worked.

Take a small plastic card insert it under the sidemarker then move it around the edges of the sidemarker and it will POP RIGHT OFF. Then take it off/replace it and pop it back in.

To take out the bulb just twist the bulb and it will pop out.

I could make a video but its simple and straightforward. Hope it helps.