Using this Fwee Dual - Type Under - Eye Fullness Filler is easy. First, clean your under - eye area gently. Then, take a small amount of the filler and apply it evenly under your eyes with a light touch. Massage it in gently until fully absorbed. Remember to keep it away from your eyes to avoid irritation. Store it in a cool and dry place. Don't expose it to direct sunlight or extreme temperatures. If you have sensitive skin, it's a good idea to do a patch test first.