Is this for one door or two?
Answer Hello Steve. 2188458A is for the freezer door only.
how to install freezer gasket?
Answer MG, You will need to "roll" the door gasket up and over until to can reach the screws holding the retainer strips to the door liner, and loosen the screws(you can remove them if you prefer), there are four(4) retainers, then remove the seal from the retainers. Before you start, you want to take the new door seal and place it in the tub with hot water, so it will be flexible, and easier to work with, when you start to install it on the door. Thanks and good luck