If it is one piece pull up starting at the rear of the sill, then work your way forward to the kick panel. They use a spring clip to hold the sill down. Install carefully to line up the clips so you don't bend them over.
Did you click on the link in post #3 of that other thread I referred you to?I have a 2017 3500 and need to take the passenger side kick panel off, it extends to the back of the front seat. Does it just pull off, don't want to be breaking anything.
Kevin
Did you click on the link in post #3 of that other thread I referred you to?