When using for the first time: (1) Gently shake the brush vertically with the cap facing downwards approximately 10 times. (2) Remove the cap, point the brush tip downwards, and knock slowly approximately 10 to 15 times to make sure the liquid comes out from inside the base of the flat brush. Adjust the amount of liquid before use, checking once on the back of your hand to ensure the liquid is evenly distributed throughout the flat brush. (3) After use, close the cap. When using for the second time or more: (1) Gently shake the brush vertically with the cap facing downwards approximately 10 times. (2) Remove the cap, point the brush tip downwards, and knock slowly 2 to 3 times to make sure the liquid comes out from inside the base of the flat brush. (3) After use, close the cap. If the liquid does not come out, knock it again 1 to 2 times to make sure the liquid comes out from the tip. Shaking too vigorously or dropping the brush may cause the liquid to leak, which may stain the inside of the cap or your clothes. Please be careful. Knocking too many times may result in too much liquid coming out, so be sure to knock once or twice to check the amount of liquid at the tip of the brush. Do not leave the brush after use; wipe it gently with tissue paper or similar to clean it before use. This may make it difficult for the liquid to come out or cause clogging. When opening and closing the cap, open and close it straight to avoid damaging the brush tip, and make sure the brush tip does not touch the side of the cap. When storing, do not store it facing down, but sideways or upright. To remove, rub it in warm water at about 40°C and let it soak in. If it is difficult to remove, use a makeup remover or similar product. When you can no longer knock the knock button, it is a sign that you have finished using it.