IF you used a password to allow the chance to edit or delete a post, you can do so. If you did not have a password programmed into your responses, you can't.

To see if you have a password, try to reply to this message. Look at the bottom of the reply page and you will see a box for "password" and a check-box for "save password." If the password box is blank, you have not triggered this option and only a moderator will be able to delete your posts.