I'm not an administrator, but 'private' means 'private' re messages between members of the forum.
Have you seen any PMs appearing anywhere in the forums?
(Members will address a part of a post to another member in particular, but this is not intended as a 'private'( = not to be seen by any other member) message.
The administrator will make that 'official' for you but long-time members have no qualms(=uneasy feeling of doubt) whenever they send a REALLY private message!
Student or Learner