To use a Peter Stone promo code, follow these steps: - Copy the Peter Stone promo code from the source. - Visit the official website of Peter Stone and complete the shopping. - During checkout, paste the Peter Stone discount voucher into the coupon code entry box. - The discount should be applied and you can enjoy the savings. Remember, the process may vary slightly depending on the website or platform you are using. Always ensure to read any additional instructions provided with the promo code.