You'll find the "Credits" section in the "Pay & Submit" step, which is the final step when placing an order. Look for it right above the credit card information fields.
To redeem your credits, simply check the "Credit" box and enter the amount you'd like to use. There's no limit on how much you can redeem, so feel free to enter any specific amount, whether it's a few cents or the full credit balance. After clicking the "Apply" button, you'll be directed to the payment page.
If you'd like a visual guide, we've included a helpful video below to assist you in navigating this process.