How do I examine a game from my history? (ICCforMac/Windows)

 On the left, above the option for 'LINKS',  you can find your username. Click on your username.

In the center of your interface your profile with ratings will appear. Next to these, on the right, your history is shown. These are your last 20 games played. (The list below your history is your library). 
Click on a game to open it.  Above your board click on the button named  'Examining mode'.