When you reply to someone's message, it is easier to reply on their profile (click on their name and reply on the box shown) so they know they got the message. Another thing you can do is click on "View Conversation" near the bottom right of the person's message and reply in the box shown.
By the way, it's OK. I was just informing you so you wouldn't get into any type of trouble.
Fun Fact: You joined the forums on my 14th Birthday.