If you no longer want to make your site available to others in the Template gallery, go ahead and remove it. This doesn't delete the original site you submitted. It just removes it from the gallery.
- Go to the original site you published as a template.
- Click More actions at the top right of the page, then choose Manage Site (you'll need to be signed in to see this option).
- Open the Template information page, scroll down, and click Delete template.