Using 3rd party Steam Coupons

[Rivener]

I grabbed a few Steam coupons from the 'Huge Seal' thing going on. They aren't in Steam at all, so the client won't offer to use them automatically. I have 2 keys I can use, but I can't find anywhere to put them in. Any help?

http://www.hugeseal.com/

[Meatbug]

Q: How can I use the Steam Discount Coupons?
After choosing the Coupons and claiming them go to the Your Steam Codes section.

Here you can see the code for each coupon. Copy the code of the coupon and go into Steam. In Steam click the Add Game button in the bottom left corner and in the drop down menu click Activate a Product on Steam.

From here, follow the instructions and insert the code when asked. Once you have the coupons in your inventory they're used up automatically upon purchasing the game in question.

http://hugeseal.com/faq