Ball not moving in simple game,Moving ball using keyboard

Ok, so I'm having trouble with making my ball move in Unity using the keyboard for a simple game I'm doing...I've been at this for hours now and I cannot figure out for the life of me what the problem is with the script. I am a COMPLETE beginner when it comes to this stuff so I have no idea how to do it. All I do know is that Javascript is preferred. Here's what I've got right now:

 #pragma strict

 //Private variables
 private var rb:Rigidbody;
 private var offset:Vector3;
 private var cam:GameObject;

 //Public variables
 public var speed:float = 5;

 //Start function
 function Start () {
     //Gets the rigidbody component
     rb=GetComponent.<Rigidbody>();
     //Main game camera
     cam = Camera.main.gameObject;
     offset = cam.transform.position - transform.position;
 }
 //Update function
 function Update () {

 }

 //Late update function
 function LateUpdate(){
     cam.transform.position = transform.position + offset;
   
 }

 //Fixed update function
 function fixedUpdate() {
     var moveHorizontal:float = Input.GetAxis("Horizontal");
     var moveVertical:float = Input.GetAxis("Vertical");
     var movement:Vector3 = new Vector3(moveHorizontal, 0, moveVertical);

     //Lets the player move around the maze
     rb.AddForce(movement * speed);
 }

 //Trigger enter function
 function OnTriggerEnter(other: Collider){
     Debug.Log(other.gameObject.tag);
     //Win if statement
     if (other.gameObject.tag == "Trigger Goal"){
         Debug.Log("I win!");
     }
     //Lose if statement
     else if(other.gameObject.tag == "Trigger Lose"){
         Debug.Log("I lose...");
         transform.position = new Vector3(0, 0.5, 0);
         rb.angularVelocity = rb.velocity = Vector3.zero;
     }
     other.gameObject.active = false;
 }

Any and all help is appreciated. ,