To apply a promo code on Southmoonunder.com, you should follow a straightforward process during the checkout phase. First, add the desired items to your shopping cart. Once you are ready to make your purchase, proceed to the checkout page. There, you will see a section specifically labeled for entering promo codes or discounts. It is typically situated before the order summary or payment information. Enter your promo code into the designated field and make sure to double-check for any spelling errors or spaces. After entering the code, you can click the button to apply it, which will update your total accordingly. If the promo code is valid, your discount will be reflected in the order summary. For any questions about promo code eligibility or specific terms, it can be helpful to refer to the current web page for more information.