How do I decoupage with napkins or tissue paper?

First check to see if the napkin is 2 ply. If so, separate and lay aside. Brush Mod Podge directly on the your surface. Carefully place the printed napkin on the surface and lightly blot down with a dampened sponge. Start blotting in the center and work to the edge. Once it is in place, let dry. After about 30 minutes lightly apply a top coat of Mod Podge.