Simply open up the pack, peel a sticker off and put it on clothing or objects near to where your exposed skin is.
Kids aged 0-2 need 1: One patch placed centrally on clothes (ie, on their jumpsuit on the stomach, chest)
Kids aged 3-5 need 2: One patch on the top clothes (sweater, t-shirt) and one on the shorts.
Kids aged 6 and parents need 2-4: One patch on the clothing next to each exposed limb (one on the sleeve of both the left and right arm, and if wearing shorts, one on the left and right side of the shorts)
