Hand histories are easy to find in the PokerStars client. First, click on Settings  over on the right side of the main lobby. Then look down the list on the left and click Playing History.  You will see two items appear, Hand History  and Tournament Summaries. 

How to Analyze Your Poker Hands Effectively in 5 Minutes

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Step 1: Record hands. ...
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Step 2: Prepare the hand history and identify the tough spot(s) ...
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Step 3: Run the numbers. ...
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Step 4: Take note of your gut reaction. ...
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Step 5: Consider different perspectives. ...
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Step 6: Reflect and take notes.