Before deleting a beat you must first remove it from distribution - this can be done from the monetization area of your Dashboard, here.
This will stop future claims, but will not release existing ones. To do this you can head to the claims section of your Dashboard and release them manually, or you can contact us at email@example.com and we will release these for you.
Content ID is available to Platinum members only. If you have a free account, you can upgrade here.