To use "Petes Real Food" promo codes, follow these steps: 1. Copy the discount code that you want to apply. 2. Navigate to Petes Real Food's website and place the items you'd like in your shopping cart. 3. Once you reach the checkout page, look for the text box for coupon codes just before payment. 4. Paste the code in that box. 5. Click Apply to claim the discount on your order and enjoy your discounted purchase.