If you have received a discount coupon code from Coolmuster, and don't know how to use it, then this article can help you to solve the problem.
Here is the detailed steps:
Step 1. Select and add your target item into cart, then you'll be taken into a new page.
Step 2. Click the sentence like "I have a discount coupon" in the left corner, then you can see an input box.
Step 3. Type the discount code you have in the blank box, and click "APPLY" button, the discount off will be available on the original price.
Step 4. Enter your address and payment information, then review the order and complete the payment process.