Interest Drill is a feature of Audience Drill that will only appear if you meet these two conditions:
1. You purchased Audience Drill Unlimited.
2. You log in to your account here: http://www.bakkersboard.com/audiencedrill/login.php
White Label users usually don't see the Interest Drill when they log in to their White Label account. They need to log in to the main account.
Interest Drill will be available at the menu bar located at the left side of the page.