hi there..
hitting the reply button like you did here works just fine. That way everyone who has been following your post will see your reply. If you have a question for one specific person that you would rather not share with everyone else, you can use the PM (private message) feature. To do that, you click on the name of the user you wish to send the message to. A list of options will appear below their name and I believe "send private message" is the second one on the list.

Looks like you are doing things just right.. glad its working for you !
Take care,
Pam