When you delete a post, page, comment, or upload from your blog, it will be moved to the Trash folder. You have separate trash folders for posts, pages, comments, and uploads. This feature makes it extremely difficult to accidentally delete a post, page, or upload from your WordPress.com blog. Items within your trash folders can be restored or permanently deleted within 30 days of their original trashing.
Posts, pages, comments, and uploads each have their own trash folders. To access them in your dashboard:
Posts: Posts -> Edit
Pages: Pages -> Edit
Comments: Comments
Uploads: Media -> Library
You will see a list of linked statuses at the top of any of the above pages. Click on the Trash link to access all files currently existing within your trash folder.
To permanently delete a post, page, or upload, you will need to enter your Trash status/queue and place your cursor over any item you wish to delete forever. You will see two linked options: Restore and Delete Permanently. Click on the Delete Permanently link.
The item should then be removed from the Trash folder/status, and you will receive a message that the deletion was successful.
You can also easily permanently delete all items currently in any Trash queue/status by clicking on the Empty Trash button.
Important: Once you choose to permanently delete an item from your Trash folder, there is no way to recover or restore it!