Retrieving active hand history

First off I am not a super computer geek.
I see posts of members posting a previous hand history and then asking what they could have done differently-or second guessing themselves about a raise or call....etc.
My question is: How do you retrieve your hand history? On Fulltilt for example.I know how the view last hand.
But how do you retrieve the actions of all the players in the hand?
Do you have to do it immediately or can you do it after the tournament?
Thanks in advance. mr3window