Your personal messenger allows you to send and receive messages from other members.
Send a new PM
This will allow you to send a message to another member. Enter a name in the relevant form field. This will be automatically filled in if you clicked a 'PM' button on the board (from the member list or a post).
There is also a 'type-ahead' feature which automatically pulls users from the database as you start typing their name.
Inbox
Your inbox is where all new messages are sent to - sorted into date categories. Clicking on the message title will show you the message in a similar format to the board topic view. You can also delete messages from your inbox.