To use the MISSHA M Signature Real Complete BB Cream EX, first, make sure your face is clean and moisturized. Squeeze a small amount of the cream onto your fingertips or a makeup sponge. Then, gently apply it evenly across your face, starting from the center and working your way out. You can choose the color that best matches your skin tone from the two available options. When it comes to maintenance, keep the cream in a cool and dry place. Avoid exposing it to direct sunlight for long periods. As for precautions, do a patch test on a small area of your skin before full - face application to check for any allergic reactions. If you experience any discomfort, stop using the product immediately.