I cant move the ball on the project roll a ball

Here is the script (i don't know how to take a picture soo i just copy it). Also tell me what i did wrong!

using UnityEngine; using System.Collections;

public class PlayerContoller : MonoBehaviour {

 public float speed;

 private Rigidbody rb;

 void Start ()
 {
     rb = GetComponent<Rigidbody>();
 }
 
 void fixedupdate ()
 {
     float moveHorizontal = Input.GetAxis ("Horizontal");
     float moveVertical = Input.GetAxis ("Vertical");

     Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
     
     rb.AddForce (movement * speed * Time.deltaTime);
 }

}