First remove the thin protective sheet and save it for storage.
Peel off the design you want to use and apply to any acrylic surface.
If you are working with metal clay, spray the stamp with Cool Slip to avoid sticking.
Impress the stamp into the clay.
You can see exactly how deep you are impressing. For a slightly different look, I can equalize the depth by turning the acrylic work surface over and pressing lighting on the image. This makes the image look more like it was stamped into metal, rather than impressed in to clay.
Store Jewel Stamps on their acrylic sheet with the protective film in place, inside its storage envelope. Keep out of direct sunlight.