If you have a valid discount code this can be added at the checkout in the box provided, under 'Order Summary'.
Please make sure you add your discount prior to checkout, as we cannot honour a discount after the fact.
If you are having further issues, please submit a help request.
*Note: only one discount can be applied at a time. For example, you can not use a Collector Club Reward and take advantage of a special offer discount at the same time.