How can I move left and right when jumpigng?

Hello I just make a simple game from Unity 3D tutorials and I want to control the player (ball) when I jumping. Sorry for my bad englis, I beginner in this, too:)

I made this script:

#pragma strict

var rotationSpeed = 100;
var jumpHeight = 8;

private var isFalling = false;

function Update () 
{
     //Handle ball rotation.
     var rotation : float = Input.GetAxis ("Horizontal") * rotationSpeed;
     rotation *= Time.deltaTime;
     rigidbody.AddRelativeTorque (Vector3.back * rotation);
     
     if (Input.GetKeyDown(KeyCode.W)  && isFalling == false)
     {
         rigidbody.velocity.y = jumpHeight;
     }
     isFalling = true;
    
}

function OnCollisionStay ()
{
    isFalling = false;
}

Add this to your code.

if(isFalling == true){
    rigidbody.AddRelativeForce(new Vector3(Input.GetAxis("Horizontal") * airControl, 
                               Input.GetAxis("Vertical") * airControl));
}