You use it in place of shampoo. Here is a quote from their site.
"WEN® Cleansing Conditioner is a new concept in hair care. A 5-in-1 formula, it takes the place of your shampoo, conditioner, deep conditioner, detangler and leave-in conditioner. It cleanses hair thoroughly without lather or harsh ingredients. It won’t strip your hair of natural oils. Your hair is left with strength, moisture, manageability and better color retention.