To use this eye liner, simply hold the pen at a comfortable angle and draw a line along your lash line. You can create a thin line for a natural look or a thicker line for a more dramatic effect. When you're done, let it dry for a few seconds to avoid smudging. Keep in mind that it's for external use only. Avoid getting it in your eyes. If it does, rinse thoroughly with water. To keep your eye liner in good condition, store it in a cool, dry place. Also, make sure to cap it tightly after each use to prevent it from drying out.