[Infill Serum] ●After washing your face at night, or after toning your skin with lotion, press the dispenser once and gently spread it over your entire face. [Full Expansion Serum] ●After washing your face in the morning or after toning your skin with lotion, press the dispenser once and gently spread it over your entire face. <How to set the refill> ●Please follow the steps below to replace. (A) Remove the cap, hold the shoulder of the dispenser, turn it counterclockwise, and pull it up. (B) Remove the dispenser from the used container. (C) Remove the cap of the new refill container and attach the dispenser. (D) Return the refill container with dispenser to the outer container and turn it clockwise until it stops. *When opening and closing the dispenser, be sure to turn the shoulder of the dispenser. Accidentally twisting the upper part may render the dispenser unusable.