do you know how to use a coupon which I got from an email

One week ago, I have got an email, which is sent by a gold seller. The email said they sell all kinds of game gold, and also give a coupon code. It said if you buy in the amount of $30 to $100, you can enjoy 3% discount with the coupon. I play wow, but I never buy wow gold online. And how I can use the coupon to buy wow gold? The coupon is u ga me g ol d4 ujo y 4u，the site is w .ug am eg ld.co m

ok, just now I have visited the site. and what is the coupon code? i tried. the code is u g a m e g o l d 4 u j o y 4 u (the blank does not need). Here are two ways you can use your coupon code. Firstly, in the Coupon Page, just enter your coupon code exactly in the field and click the Submit botton. Secondly, during the checkout process, in the Shopping Cart page, there is an input field for coupon code.
After you put in the appropriate coupon code in and continue, the total amount would be updated with the bonus of the coupon. You can review the total currencies before completing the order.