Enter the following during game play.

Attack: Press Circle(2), Square, Circle.
Walk: Press Square(3), Circle.
Protect: Press Triangle(2), Square, Circle.
Retreat: Press Circle, Square, Circle, Square. Note: This cannot be done until later in the game.
Charge: Press Circle(2), Triangle(2). Note: This cannot be done until later in the game.
Miracle: Press X, X(2), X(2). Note: All four miracles use the same pattern.