You will need to be an administrator and login to your website. You can delete your website by going to Site Admin->Setup->Options. At the bottom of the page you will find the option to delete your website. If you are a Hockey Clubhouse Pro subscriber, you will have to make sure your subscription is cancelled before the option to delete your website is active.
Ensure you confirm your intention to delete by typing DELETE into the confirm box. Then click Delete FOREVER.
NOTE: All deletions are permanent, this includes all stats, images and content.