It's very easy to use, click on "Show Coupon Code" and copy the code.
Let the saving begin. This is how:
1. Go to Karenmillen.com.
2. Fill in your country and language.
3. Search for your desired item and click on it. A new page appears.
4. On this page you have the description of your item. Pick your desired color and size.
5. Click on "Add to bag" and a pop up page appears, click on "Checkout" on the next page.
6. On this new page, type in your email and click on "Checkout now".
On the next page, on the right side of the page, you have your order summary. Look down and see "Click to enter here", press it and enter your code here.
That wasn't so bad.