Since I ordered mine later and didn't know when the code expired I just waited for the discount to be applied to my checkout total for the starter I bought and once it went through I purchased it.
Yes, and to expand, just click on the "buy it now" tab, and on the next page, if you scroll down to under the payment methods, there's a line for the coupon code. Click apply and make sure it discounts the item you're trying to buy. If not, just go to another page.