How can i add an accelerometer to this?

My game is in 2d (doodle jump style) and in my dumb brain i thought this was an input to the accelerometer how can i fix it?

[RequireComponent(typeof(Rigidbody2D))]
public class player : MonoBehaviour {

    public float movementSpeed = 10f;

    Rigidbody2D rb;

    float movement = 0f;

    // Use this for initialization
    void Start () {
        rb = GetComponent<Rigidbody2D>();
   }
   
   // Update is called once per frame
   void Update () {
        movement = Input.GetAxis("Horizontal") * movementSpeed;
   }

    private void FixedUpdate()
    {
        Vector2 velocity = rb.velocity;
        velocity.x = movement;
        rb.velocity = velocity;
    }

    public void SetSpeed(float modifier)
    {
        movementSpeed = 10f + modifier;
    }

Input.acceleration

this might help…