To use this 3CE matte lipstick, simply start by applying it directly to your lips. You can use the applicator to outline your lips first for a more precise look and then fill in the rest. For best results, make sure your lips are clean and dry before application. When it comes to storage, keep it in a cool and dry place, away from direct sunlight. Also, don't leave the cap off for too long as it may cause the lipstick to dry out. If you notice any changes in texture or smell, it's best to stop using it.