To replace the wiper blade, first, you have to remove the old blade, by pulling the insert out of the wiper arm guides and using needle nose pliers if the guides are too close together. Take out the old insert from the guides while at the same time be keen on the position of the insert. Remove the metal support strips of the old insert and fit these on the slots of the new insert and make sure that the cutouts on the right side of the support strips are facing up. Insert new wiper blade through the wiper blade slot by sliding it to the end slots and it fits. Sometime wiper blades may have two retaining tabs available in the particular model type.