by JimN » 28 Feb 2012, 02:50
Open your own post.
Press the edit button.
Over on the left, just above the text area, there is a label: "Delete post".
Put a tick in the box just to its right (the box further marked "Once deleted the post cannot be recovered").
Press the submit button.
A message asks if you really really really want to delete the post.
Tick "Yes".
Done.
{Just checked it all through and it works as I describe above.]