'... i cant change the time... its 2 hours ahead of me.. im in chicago ...' - ...
01. Launch 'System Preferences' (either select the 'Apple System Preferences' menu item, or locate 'System Preferences' in the '/Applications/' folder).
02. Click on the 'Date & Time' utility.
03. Click on the 'Time Zone' tab.
04. Select your time zone, in the map.
05. Select your city (or the nearest one) from the 'Closest City:' popup menu.
06. Close the window, thus - quitting 'System Preferences'.