To use this eyeliner, simply hold it like a pen and gently draw a line along your lash line. You can start thin at the inner corner and make it thicker towards the outer corner for a more dramatic effect. When applying, keep your hand steady for a smooth line. As for storage, keep it in a cool, dry place away from direct sunlight. Avoid getting it wet, and if it starts to dry out, you can try gently twisting the base to get more product. Also, don't share your eyeliner with others to prevent eye infections.