Private messaging where is the button to view sent and received?

I cant see a button etc to view sent and received private messages, though manged to send one by clicking a posters name and the envelope.
Unable then to view it and look to see a reply has been received !


Steve -
When you click on your avatar in the upper right corner, you will find 3 tabs for notifications, bookmarks, and messages:
Also, when you get a reply to a PM, you will see a green notification balloon on your avatar.