"There are screws on the front and the rear of the plastic trim piece. Then there are little plastic tabs. If I remember correctly, I used vice grips to gently tug the plastic tabs out. Many of the tabs broke on mine but you can buy replacement tabs from the dealer, which is probably expensive. you can also try an auto parts store for more affordable tabs. I haven’t got around to replacing the ones i broke yet, so i have some empty holes. Thanks for checking my blog and good luck with your repair. Another thing i did was i drilled some small holes in the bottom of my plastic trip pieces to help with water drainage to try to prevent a re-occurrence of rust."