The quickest way to delete a collection is from the home page. Click on the vertical "..." icon that appears when you hover over the collection tile, then click "Delete".
Alternatively, you can open the collection's settings by clicking the collection's title when it is open. In the mobile version, also click Settings. Then select the "Permanently delete Collection" option in the action menu.
Please note, deleting a collection is an irreversible action. Once you’ve deleted a collection, it cannot be recovered. Click "Delete" to confirm.
Only the collection owner will be able to delete a collection. To learn more about permissions, read the guide to user permissions.