said by BSAIII:How do I post a message to a thread without Replying to a person or the OP?
You don't. Those are the only options.
said by BSAIII:I see messages that do not have have a 'reply to' at the top of the message.
Those are messages that reply to the immediatly preceding message. It does not show who you are replying to, if it is the message immediately above on you screen.