But if you wish to continue to use the previous green theme:
(1) Select 'profile' from the "Hello xxxxx" drop down menu at the top right of the screen.
(2) Under 'Modify Profile' select 'Look and Layout'.
(3) Under the big blue box you will see 'Current theme' and 'Simple Theme (change)' ..... Select 'change'.
(4) You will now see all the themes listed and simply select (Use this theme) for the one that you would like to use
Best wishes
Mike
PS: You also access your PM Messages via the "Hello xxxxx" drop down menu at the top right of the screen.