If you edit your post to something you want, then cool. If you really can't stand having that post there, edit it to a '.../ please delete' and a mod might come along and remove it if they see it. If its urgent, you can PM a mod, but not too often as it's a tad annoying to do (and we dont mass delete your posts if you ever want to delete your account, you just need to think about what you write before you write it!)
Also keep in mind deleted posts that are quoted by someone will still have the original post quoted and we cant delete that without the quoting users permission.