PM stands for private message. These are used whenever you want to communicate with another board member without anyone else being able to see your message. The PM system is much like email in that no-one can gain access to your messages unless they know your password. The method used to send a PM to another member is very similar no matter which type of bulletin board you are using. You can either browse through the members list to find the person you want to contact and then click on the adjacent PM button, or even easier than that, you can locate the PM button in the member's replies on the board and click on the link from there.
Whenever you click on the PM button, analogously to email, you will be presented with several empty information fields, which must be filled in before you can proceed. These include a 'to', 'from', 'topic' and a message box. Providing you are already logged into the board, the first two fields will be entered automatically, leaving you to give your message a topic title, type the text of your message into the large empty space and press the send button.
Whenever you click on the PM button, analogously to email, you will be presented with several empty information fields, which must be filled in before you can proceed. These include a 'to', 'from', 'topic' and a message box. Providing you are already logged into the board, the first two fields will be entered automatically, leaving you to give your message a topic title, type the text of your message into the large empty space and press the send button.