To apply a discount code on Day-timer.com, start by selecting the items you wish to purchase and adding them to your shopping cart. Once you are ready to check out, you will be directed to the shopping cart page where you will see an option to enter your discount or promotional code. Enter the code exactly as it appears, paying close attention to any capitalization or special characters. After you have entered the code, click the button to apply it, and the discount should be reflected in your order total. Make sure to review the terms and conditions associated with the discount code, as some may have expiration dates or restrictions. If you have any difficulties during the process, it is best to consult the relevant section on the Day-timer.com website for further assistance.