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You can buy them in well-stocked beauty shops and online. Some clothing stores may also sell them. They come in packages of 2 to 3 sheets, and look like the temporary tattoos you put on your skin. Go through the sheets, and choose an image that appeals to you. Cut the image out with a pair of scissors. You can cut out more than one tattoo, but you will need to apply them one at a time. If you plan on just tucking a strand of hair behind your ear, you can skip this step. If you plan on pulling your hair into an up-do, a ponytail, bun, braid, or anything else, you should do that now.  Hair tattoos are stiff, sort of like stickers. If you try to style your hair after you apply the tattoo you risk ripping the tattoo and distorting the image.
Purchase hair tattoos. Cut out the tattoo that you want. Style your hair, if needed.