Using Steps:
Step 1: Wash breasts and fingers thoroughly
Step 2: Uncover the dust film from the nipple covers
Step 3: Put the central protection point(sometimes it is not completely in the middle) of nipple cover on to the nipple softly, making the outer edge of which be stick to the skin
Step 3: Put the central protection point(sometimes it is not completely in the middle) of nipple cover on to the nipple softly, making the outer edge of which be stick to the skin