Once you have added your desired subscription into your cart you will be able to add your code into the "Promo Codes" field in your basket, before you proceed to checkout. If you do not see this field, please return back to your shopping cart rather than proceeding to checkout. The field should then be visible.
If you have successfully used your promotional code, you will see a green banner at the top of your cart that confirms the promotional code has been applied successfully.
Only one promotion can be used at a time.