I have a honda accord coupe 2013.Do I have to take the back bumber off to replace the silver molding?

I have a honda accord coupe 2013. Do I have to take the back bumber off to replace the silver molding?

What part you're talking about? Is it number 10? If that the case then yes you'll have to take the rear bumper "skin" off due to the "alligator" clips that hold the molding onto the skin and have to be installed from behind.
Edit: Just update the information. I'll be back and answer any question you might have.