To use this eyeliner, first hold the brush steady and gently apply it along your lash line. You can create a thin line for a natural look or a thicker line for a more dramatic effect. Make sure your eyes are clean and dry before application. When you're done using it, keep the eyeliner in a cool, dry place. Don't let the brush get too dry, and if it does, you can dip it in a little bit of makeup remover to clean it up. Avoid getting the product in your eyes as it may cause irritation.