A couple of people have sent me PM's saying 'please forward this on because I don't know how to send PM's to multiple people'.
Since I worked out how this morning I thought I would share....
Under the box where the user name of the recipient of your pm is written there is a white box. Type the user name of the person you would like to add and the click the button to the right (this button has + ADD on it, if you wish to secretly copy people in click + BCC). This adds another recipient, et voile!