Copy the promo code on your clipboard, and then visit lululemon.com to choose the products you want to buy. Add your desired products to your cart. When you are done, click on the shopping bag icon located in the top right corner of the website. This will lead you to the checkout page. On this page, you will see a box that says 'Enter Promo Code'. Pate the code in this box and then hit 'Apply' and look for the price alteration in your total bill.