To use "Moon Pals" promo codes, follow these steps: 1. Select the items to purchase on the Moon Pals website. 2. After choosing the items, proceed to the checkout page. 3. On the checkout page, there will be a field to enter the coupon code. Enter the code in this field and click on "Apply".
Please note that the actual process may vary slightly depending on the website's design and the specific terms of the promo code. Always make sure to read the terms and conditions of the promo code before use.