The action button is a button on your controller that accesses buttons, controls, basically, ANYTHING that the game will let you do. On PlayStation, the action button is The square button. On Xbox, it is the x button. On wii it is the A button, ds, wii, and PC, I am not sure.
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It is the x button
The save button.
Press the A button
Press the fire button
circle is the button to crouch, hold it to lie down.