Your decals go on the outside of your Helmet.

CLEAN: Clean the OUTSIDE of your helmet.
PEEL: Peel the decal away from the paper backing. Make sure all the decal comes with the tape. STICK: Position the decal on the surface and stick it on the helmet's surface. Rub the decal with your hand to make sure it seals on the helmet. Work any bubles or creases to the edge of the decal with your fingers or a credit card until it is smooth.
PEEL: Slowly peel the tape away from the decal, if it lifts put it back on the helmet and rub it until it sticks. Once stuck on the helmet it will stay.