This question already has an answer here:
The Peer Pressure badge is awarded if you delete your own post with a score of -3 or less. The Disciplined badge is awarded if you delete your own post with a score of 3 or more.
My question is, how do you delete your own post? I can vote for the deletion of my own questions, but I can't delete them outright as Stack Overflow doesn't seem to let you do that.