hi,select columns, tab on it and resize it
open that link and you will see it
instruction with pictures for easy understanding
here is more directions ---->>> http://support.apple.com/kb/PH3367?viewlocale=en_US
if that workout for you, please click accept. thank you
please try again,i dont know what other way that more clear than those instructions with pictures. if you need something more than that, you might need to go to apple store and have face to face instruction with apple genius person.