Oh, if you want to reply to something left on your wall the usual way is to click on "view conversation" then answer and send in that window. That way the answer appears on the profile page of the person who left you the message. Most people don't tend to literally drop in to someone else's profile page multiple times. You do the first time and, if answered, you then have what amounts to a back channel.
And I'm not trying to beat up on you, only suggesting that when someone comes in, launches a great many threads on a single topic and doesn't sit heavily in any of them the long term prognosis for discussion isn't very good. :cheers: