Using this little black diamond lipstick is easy. First, make sure your lips are clean and dry. Then, apply the lipstick directly to your lips, starting from the center and moving outwards. You can apply an extra layer for a more intense color. As for storage, keep it in a cool and dry place to maintain its quality. When it comes to safety, avoid sharing the lipstick with others to prevent cross - contamination. If you experience any irritation, stop using it immediately.