I have a promo code. How do I use it? January 25, 2021 22:39 Simply enter your promo code under the "Coupon/Gift Certificate" field at checkout to apply your promo code. Related articles Why is my promo code not working? Are there any restrictions for promotions? What is your shipping policy? What is the difference between The Hair Shop brands? (i.e. 808, 707, Exclusive lines) Comments 0 comments Please sign in to leave a comment.