Using the Portable Double - Ended Concealer is a breeze. First, decide whether to use the small brush or the micro - porous sponge tip based on the area you want to cover. If it's a small area like a blemish, the brush is a great choice. For larger areas, use the sponge tip. Simply twist the pen to dispense the concealer and apply it gently to the areas you want to cover. Then, blend it in with the tip. As for maintenance, keep it in a cool and dry place. Avoid exposing it to direct sunlight or high temperatures as this might affect the quality. And remember, after each use, make sure the cap is tightly closed to prevent the concealer from drying out. Also, check the expiration date regularly. If it's past the 3 - year shelf life, it's time to get a new one.