Just in case you want to use the PM box, just follow these instructions:
Top of the screen, click on 'Notifications' - next click on 'Inbox' - on the left select 'Send new message' - In recipients users box type Brin -
next fill in the 'Title' box if you want to - next in the large box below type your message - next, bottom right hand corner click 'Submit Message'........it sounds a lot but takes about 5 seconds to get to the message box.