Hey! Just a tip : If you reply on your own profile people won`t see if you replied on their vm (Visitor Message) or not. Here are two better options how to reply on someones vm (Visitor Message) :
1) Click on the name of the user, then type your text in a textarea, then press "Post Message". or
2) Click on "View Conversation" at the bottom right corner of a Visitor Message, then type your text in a textarea and click "Post Message".
Okay, try to reply on my vm now by using one of the two methods I mentioned above :)