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Open the Steam Client click the "+" in the bottom left corner, "Activate a product...."
You'll need to get a refund through Amazon. You should look for new unused/opened physical games or digital cd key codes from sites like this http://isthereanydeal.com/#/search:halflife%202;/scroll:%23gamelist
There is no "register site", you go to "Activate a Product on Steam" and enter the code. You didn't need to necro a Thread from 2015 for this.