In response to multiple messages that I've seen stating which have been editted saying 'can't delete my post,' here are instructions to delete your own post. :)
1. Click Edit.
2. Look at the row of buttons under the Reason for Editing box, which is in turn located under the actual post edit box.
3. Click the Delete button.
4. Choose the Delete Message radio button.
5. Add a reason if you want, but it's not necessary.
6. Click the Delete This Message button.
A message is nice to let the mods know why you deleted the message, especially if you delete a lot of them so they don't suspect account comprimise. Messages on vB are only soft deleted unless an admin removes it, so mods can still read it, so don't curse them out then delete the message :P.