You may send a new message to a bulletin board in the following way:
Double click on the relevant bulletin board in the Recipient Address Book window.
Enter a subject into the Subject field.
Enter your message in the Message window. You may use the format bar to add formatting and colour to the text that you enter.
Press Ctrl+S to send the message to the bulletin board.
Another way of sending a message to a bulletin board is by simply dragging the message from another folder and dropping it onto the bulletin board. You may only add top level messages to the bulletin board in this way.