You can access and review the metrics for your competition by going to its dashboard:
From your organizer homepage, select the “Dashboard” link under the competition you'd like to view.
From this page, you will be able to see a variety of metrics about your competition, including the current number of registrations (both the total and broken out by division), the number of views of your competition page, and revenue to date.
For example, clicking on "Dashboard" for a newly created competition "Can You Hack It?" from the organizer's competitions homepage:
This loads the competition's dashboard pictured below, where we can see there's been one registration, entered by the organizer (so no outside views) using a coupon code which brought that registrant's fee to zero. These numbers will change as additional athletes register to compete.