How to use On-Screen Buttons in unity 5 {URGENT}

HERE IS HOW TO DO IT IN DETAIL:

first of, create a player gameobject, and attach the script to it: the script is posted below

then create a button UI object and go to it's OnClick tab, and assign player gameobject as the target.

then click on the dropdown menu there and locate the jumpPlayer method. this means whenever the button is clicked the following method of the following target will execute!

now if everything is right, it should work in mobile too.

clicking the button with a mouse or a touch pressing should execute the method and make the player jump.

HERE IS THE FULL SCRIPT:

 #pragma strict
 #pragma strict
  
   @Header ("Player Settings")
  var rotationSpeed = 100;
  var jumpHeight = 0.1;
   var distToGround : float;
   
  @Header ("Player Hit Audio")
  var Hit01 : AudioClip;
  var Hit02 : AudioClip;
  var Hit03 : AudioClip;
  
  @Header ("Movement Setting")
  var forwardVelocity : float = 5;
  var backwardVelocity : float = -5;
  
 @HideInInspector
  var player_rigidbody : Rigidbody ;
 
  
  function Start() {
      distToGround = GetComponent.<Collider>().bounds.extents.y;
      player_rigidbody = GetComponent.<Rigidbody>(); // Get this objects rigidbody
  }
  
  function Update () 
  {
      
      //Handel ball roation (right; left) 
      var rotation : float = Input.GetAxis ("Horizontal") * rotationSpeed;
      rotation *= Time.deltaTime;
      GetComponent.<Rigidbody>().AddRelativeTorque (Vector3.back * rotation);
  
      if (Input.GetKeyDown(KeyCode.UpArrow) && IsGrounded ())
      {
          playerJump();
      }
      if (Input.GetKey(KeyCode.LeftArrow))
      {
          playerMove(-1);
      }
      else if(Input.GetKey(KeyCode.RightArrow))
      {
          playerMove(1);
      }
      
  }
  
  function playerJump(){
  if (IsGrounded ())
       
       {
           GetComponent.<Rigidbody>().velocity.y = jumpHeight;
       }
  }
  
  function playerMove(Dir : int){
         var rVel : Vector3 = player_rigidbody.velocity;
         rVel.x = (Dir == 1) ? forwardVelocity : backwardVelocity;
         player_rigidbody.velocity = rVel;
  }
  
  
  function IsGrounded () : boolean {
      return Physics.Raycast(transform.position, -Vector3.up, distToGround + 0.1);
  }
  
  function OnCollisionEnter () {
      var theHit = Random.Range(0, 3);
      if (theHit == 0)
      {
          GetComponent.<AudioSource>().clip = Hit01;
      }
      else if (theHit == 1)
      {
          GetComponent.<AudioSource>().clip = Hit02;
      }
      else {
          GetComponent.<AudioSource>().clip = Hit03;
      }
      GetComponent.<AudioSource>().pitch = Random.Range (0.9,1.1);
      GetComponent.<AudioSource>().Play();
  }

I HAVE UPDATED THE SCRIPT INCLUDING THE MOVEMENT FUNCTION! the method is same when assigning to the move right and left UI button, in the dropdownmenu look for playerMove(int Dir) and assign it with the OnCLick.

ALSO YOU NEED TO ASSIGN A INTEGER VALUE. USE 1 OR -1 DEPENDING ON YOUR DIRECTION.