The only way I can see is a long way around not sure if there is an easier way. If you go into your profile (top right corner)
Then on the left click my messages, then click new message. Oh you need to note the persons name you want to send a message to before all that though.
Might be easier if the tech team added a button under peoples name - or there might be a button somewhere that I can't see and I have just done it the long way.
Hope that helps
Erica
CM Cheshire West and Chester