1. Choose a product you would like to buy and click on the registration link. You will find yourself at Plimus (ordering and registration system), fill in the required fields including coupon code and click on the "Next" button:

2. Page will be reloaded and you'll get coupon discount, price for the product you have chosen to buy will be decreased:

3. Enter required information, including the billing address and payment method, and click on the "Submit" button.