My Frog still won't move! It just hop from side to side. I went back through the videos and checked my code but it still

private Animator playerAnimator;
private float moveHorizontal;
private float moveVertical;
private Vector3 movement;
private float turningSpeed = 20f;
private Rigidbody playerRigidbody;

// Use this for initialization
void Start () {
    // gather components from the player game object
    playerAnimator = GetComponent<Animator> ();
    playerRigidbody = GetComponent<Rigidbody> ();    

}

// Update is called once per frame
void Update () {
    // gather information from keyboard
    moveHorizontal = Input.GetAxisRaw ("Horizontal");
    moveVertical = Input.GetAxisRaw ("Vertical");

    movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
}

void fixedUpdate () {
    // if player's movement vector does not equal zero...
    if (movement != Vector3.zero) {

        // ...then create a target rotation based on the movement vector...
        Quaternion targetRotation = Quaternion.LookRotation(movement, Vector3.up);

        // ...and create another roation that moves from the current location to the target rotation...
        Quaternion newRotation = Quaternion.Lerp (playerRigidbody.rotation, targetRotation, turningSpeed * Time.deltaTime);

        //...and change the players rotation to the incremental rotation
        playerRigidbody.MoveRotation(newRotation);

        // ... then play the jump animation.
        playerAnimator.SetFloat ("Speed", 3f);
    } else {    
        // Otherwise, don`t play the jump animation
        playerAnimator.SetFloat ("Speed", 0f);
    }
}