Saving your Hand Histories is quite easy – simply go to the PokerStars Lobby screen and select ‘Options’, then ‘Instant Hand History Options…’
You will now get a prompt, where you need to check the ‘Save My Hands History’. Check it and click OK – you are now saving all your hands.
Also take note of the option to ‘Change Folder…’, which will let you choose a custom location for your hand histories, along with the ‘Open Folder’ button which lets you instantly open the folder where you are currently saving your hand histories. Using this prompt, you can also choose the language in which your histories are written, and for how long they are to be stored on your computer.