Using this eyeliner pen is super easy. First, hold the pen like you would hold a pencil. Then, gently glide it along your lash line, starting from the inner corner of your eye and moving towards the outer corner. For a more dramatic effect, you can make the line thicker at the outer corner. When you're done using it, make sure to cap it tightly to prevent it from drying out. Keep it in a cool and dry place. Also, avoid getting it too close to your eyes to prevent irritation. And if you accidentally get it on your skin, you can use a makeup remover to clean it off.