i assume you mean the trim 3/4 down on the door take the door card off and with the window up you should see some plastic clips about 3/4 down the door could be white / black , squeeze / pop them out and the whole thing should come away if you cant see clips then its glued in place , now when you put the new one in you may have to buy new clips only a few £ you may also need get some adhesive to keep it in place. you will find some are just clipped in place and some are clipped & glued depending how good a fit the moulding is if this is not the trim then send a photo and i will see if i can send the info you need hope it helps Ron