All the content is in the block chain.
If you posted by error, it is not possible remove the post
Yesterday I had an error and posted twice the same thing. When I realized that the post was already posted, I began to search the "delete" button to remove the doubled post..
but..
There is no remove button!
The alternative
But there is a kind of alternative do to "remove" an already posted article, and is opening the post that you want to elimiante and replace all the text by a single "."
You must do it in the header and in the body of the post.
If you have been voted, it is a good Idea to explain what happend and apologize to that people.
Think twice before you post, you can't delete later on..!