The temporary tattoo brand that you choose should come with a list of instructions on how to apply it. This may vary slightly from company to company, but it is generally a straightforward process. Make sure the skin is clean and dry first. Remove the foil from the one end of the tattoo and place the sticky side down onto your desired location. You can use a damp cloth to press it down. Some products do not need you to use water at all. Keep the tattoo on your skin for the length of time as stated by the instructions, anywhere from 30 seconds to 60 minutes.