You can do this by pressing the console's "On" switch or by pressing a connected controller's PS button., This will sign you into your PlayStation 3's home page., This will open the PlayStation store., You'll do so in menu bar on the left side of the screen., This option is on the left side of the screen., You can download a free demo for any game listed on this page., This option is below the game's icon on the left side of the screen. Once you press X, your selected demo will begin downloading.

Once the demo finishes downloading, it will be available in your PS3's game library.
Turn on your PlayStation 3.
Select a profile and press X.
Scroll down to select PlayStation Store and press X.
Scroll down to select Games and press X.
Select Demos and press X.
Select a game you'd like to try and press X.
Select Try Free Demo and press X.
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