Left joystick is to move around.
Right joystick is to look around.
B is to deploy the parachute.

Purchasables:
Left trigger is thumbs up.
Right trigger is to flip off.
Y is to spray paint.
X is to caffinate.

In Menus:
Left joystick to move the highlighted box around.
Right joystick to more the cursor around, A to select.
Or press the start button to activate which ever box is highlighted (middle right button).