To apply a discount code you have to follow these steps:
1. Add the product you want to buy to your basket.
2. Click on View Basket.
3. Click on Select discount and you will see all the gift vouchers assigned to your profile. Below these you will have the option to add the code.
4. Click and enter your code.
5. Accept.
Congratulations, you've made your purchase through the App using your discount!