Hi, I'm a fellow hubber. When you signed up with Amazon, you needed to create an Amazon associate ID. When you sign in, this is displayed in the upper left hand corner of your screen. On mine, it is listed as "signed in as" and "tracking ID". The tracking ID is what you'll use (from my understanding). HubPages also wrote information on this, including a step-by-step tutorial, in their help section. I hope that helps!