It's easy kid, just click on my avatar and click again on the "Private Message" button on the left. Then title the message and send it. Or click on the right button to visit my profile page and see what wampeters, foma and granfalloons I'm spreading.
The profile page is kind of neat because it gives a synopsis of everything about a person's activity. I use it to check someone out who I suspect might be a troll.
One other thing that you've probably learned ...there are five little boxes in the upper right part of your screen. Or maybe my screen is different since i'm also on The Hive But I'm pretty sure you have a least three boxes, one that when clicked on gives you an accounting of who has liked or responded to one of your comments, another to search for topics and the last one with your avatar that will take you to your very own profile page.
Hope this helps, if you need more clarification please let me know.