How do you properly glue up shower walls for a seamless and secure installation?

To properly glue up shower walls for a seamless and secure installation, first ensure the walls are clean and dry. Apply a waterproof adhesive to the back of the panels and press them firmly against the wall. Use spacers to maintain even gaps between panels. Allow the adhesive to dry completely before sealing the seams with silicone caulk for added waterproofing.