Attatch the adhesive strips to the battery first, putting the black tabs over the front edge and sticking them down then peel the backing off-that's the Top done. Then fold the strips under the battery and allow the strips to adhere underneath on the back of the battery. Remove the backing from the strips underneath that are stuck to the bottom of the phone , plug in new Battery and carefully seat the battery down on to the rear phone case. Be careful, you will only get ONE go at this per set of strips. It is always worth an extra Buck for 2 sets of strips in case you make a mistake.