To apply a coupon code on Meritline, you should begin by adding the desired items to your shopping cart. Once you have finished selecting your products, navigate to the checkout page. There you will find a designated field or box labeled for coupon codes or promotional codes. Simply enter the code exactly as it appears, ensuring that there are no extra spaces or typos. After entering the code, you should click on the "Apply" button to submit it. The checkout process will update your total amount, reflecting the discount provided by the coupon. It is important to note that some codes may have specific terms and conditions, such as expiration dates or minimum purchase requirements. Therefore, it is advisable to verify the details of the coupon on the web page where you found it. This ensures that you make the most of the offer while completing your purchase.