To apply a promo code or discount to an order at Bike Nashbar, customers typically begin by browsing the website and selecting the desired items to their cart. Once ready to check out, they can proceed to the cart or checkout page. Here, there is usually a designated field where customers can enter their promo code. It is important to carefully enter the code exactly as it appears, ensuring there are no typos or extra spaces. After inputting the code, customers should look for an option to apply or submit, which will update the order total if the code is valid. It is advisable to check the terms and conditions associated with the promo code to ensure it applies to the selected items. If customers are looking for more detailed guidance or specific promotions, the current web page may provide further information.