If your pre-cut adhesive has pull tabs facing the center hole, the adhesive will attach to the phone's battery well first.

If your pre-cut adhesive strip has pull tabs on the outer perimeter, the adhesive will attach to the battery first.

Peel the clear plastic liner off of the pre-cut adhesive strip, exposing the adhesive.

Line up a long edge of the adhesive with the proper surface, as determined above.

Carefully set the adhesive down on the surface.