You'll then get a template variable 'forum_num_moderators', which contains the number of moderators for the forum, and forum_moderators, which is a template loop variable that you can loop through to do things with the moderators.
However, since your case is a little more specific, you might want to call the function from a template global. The following isn't guaranteed to work, but should be a good place to start from:
(removed - see updated code in later reply)
Now in a template when the user has requested a moderator be notified, you want to add:
<%name_of_global($forum_id, $current_user_username, $post_id)%>
That should send an e-mail to each moderator, notifying them of the post.