At checkout when you are reviewing your cart, there should be an option to enter a promo code. On a mobile device it's right before your process the payment for your order:

On a Desktop you can insert the ambassador code on the top right of the checkout page:

If you are an ambassador and have completed a purchase without using the discount code and are seeking a refund, feel free to contact customer support at hello@actawear.com and we will process a refund for you after we confirm your ambassador registration & order.

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