After login, click the link Private Message, enter into Private Message (PM) management window.
Click Send PM, fill in receiver's username and message, then click Submit(or Ctrl + Enter) to send the P.M.

Click Unread Message to check new message

Click Search to look for all messages by specified keyword

After login, click Private Message, then click Send PM. If you have buddies, select the target names from the buddy list, then click Submit.

Click the avatar or ID, you can view the information of this member. Attention: You may need the permission to view other members' information.

Click the Search button, insert the keyword, then specify the search range.

Posting threads to earn credit. You will get bonus from Digest posts. Digest posts would win bonus of Prestige, Contribution, Wisdom, even Gold. An excllent thread may be rated as a Digest post.