Boards and Users Lists
You can find Boards list and Users list (if you entered one or more boards) in the right side of the application:
Users list shows users participating or watching current board with user's thumbnail, username and short description. Click username to open user's profile page.
Boards list contains all available boards list and the link to create new board (learn more about that here). Each board item shows board's type (viewable, editable, public or password protected), board's name with current members count. Also it has buttons to edit board properties (if you are the admin or board's owner) and Enter/Exit button to enter or leave the board.