Measure the length of the tub or floor of the shower. If you are installing the shower guard on a stand-alone shower without a tub, make sure you obtain a shower guard tall enough to be effective. A typical shower guard measures 36 by 16 inches.
Clean the surface with warm soapy water and a sponge to remove soap scum. You need a clean surface for the adhesive on the shower guard to stick. Dry the area with a towel.
Peel the paper from the adhesive on the shower guard. Press the L-shaped shower guard firmly to the corner of the shower inside the shower door. The long edge goes against the wall and the shorter length along the floor of the shower or rim of the tub.
Add another L-shaped shower guard to the opposite corner in the shower. Make sure to place the shower guard inside the shower door to keep the water inside the shower.