Xbox 360 Help Online

I found sum codes online, and it says "While in game, open the pause menu, hold the left shoulder button and enter the following code:
(single player only) ", but wen i hold down the left shoulder button, and i put in the code (for example: X, B, X, B, Left Thumbstick, Left Thumbstick, Y, A, Y, A, Right Thumbstick, Right Thumbstick: Third Person View), they never work...wats the problem??
(and, how do use the snake cam??)
(Im not using these cheats to beat the game, ive already beat it, im just playing it for the fun of it now)

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