No need to "friend" a moderator.
You can use Quick Links -> View Forum Leaders and PM anyone you like.
As long as you've read the FAQ and are asking a forum related question I think most will be happy to help answer.
And you could Search and start a thread (like this one) if you can't find an answer.
If you look at the bottom of "Home" and "Forum" you'll see a list of names of who's online, Orange = Mentor, Green = Advisor, Blue = Team Leader, Red = Administrator