Using this Crazy Color Vibrant Red Shampoo is super easy. First, wet your hair thoroughly. Then, take the shampoo and apply it to your wet hair. Gently massage it into your roots and work it down to the ends of your hair. Let the shampoo sit on your hair for 1 - 2 minutes so the pigment can do its job and transfer onto your hair. After that, just rinse it out. It's important to note that you should always do a patch test before using this product regularly. Apply a small amount of the shampoo to a small area of your skin and wait to see if there's any redness or itching. If you experience either of these, don't use the product anymore. To maintain the great results, use this shampoo as needed between your regular hair - dyeing sessions. It'll keep your red hair looking vibrant and fresh.