Just done a basic search for deleting posts, and it looked to me that there isn't some kind of tutorial for it.
Basically, after you have replied to a post, if you click on the http://www.hotukdeals.com/forums/images/custom_buttons/edit.gif
which is located bottom right of your post, yoiu can then edit the text. Bottom right corner again, you will see this http://i37.photobucket.com/albums/e90/birdyboyuk/d8165649.gif
, obviously, you'll click delete. Once clicked an option in bottom left corner will appear giving you the option to delete your post.
I mainly done this for people who have posted twice by mistake :thumbsup: HTH