Once you've registered and verified your email address, you will be able to post new threads, reply to threads, edit your signature and profile, and start private conversations with other members. Your new threads and replies will be automatically added to the moderation queue. They will not appear until approved. Where you go from there depends on your performance. If you post well, you'll be taken off the mod queue and given PM permissions. If you need to say something to a specific person rather than the whole forum, use the private message (PM) function. In Xenforo this is called a "conversation". To start a conversation, click the user. When his profile loads, click the "information" tab. Then click "start a conversation".