Hi GB,
When you do an opening post, there's something you click on, above the subject header I think, which says "delete post" I believe. It tells you once deleted it cannot be restored I think.
Once posted, I don't know if you can go into the edit function and do the same.
Failing that, you can go into edit function and just delete the text, re-write ",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,," or something to that effect or "deleted by author".
Sincerely,
Mouse