Hi
a) Your question is unclear. You have not circled the door handle....The part you refer to pops off, revealing a screw - one of those holding the door cover on. Can you take a better photo, and explain what you are trying to do?
b) Ideally your post should be in the W208 forum, where the problem will be shared with other early CLK owners. Also please complete a 'profile' with User CP.