Using this nail polish pen is easy. First, make sure your nails are clean and dry. Then, apply the nail polish evenly on your nails like you're writing with a pen. After that, put your nails under an LED or UV lamp to dry for a few minutes. Remember, don't touch your nails right after applying to avoid smudging. When it comes to maintenance, try to avoid exposing your nails to harsh chemicals for a long time. If you want to remove the polish, use a nail polish remover suitable for gel polishes. Enjoy your beautiful nails with this amazing nail polish pen!