How to convert Mouse input to touch input for android devices ?

This is my the code I’m using to switch from UI scene to Play scene (it’s a simple PONG game and I’m not good at coding).

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Play : MonoBehaviour
{
    void OnMOuseDown ()
    {
        transform.localScale *= 0.9F;

    }

    void OnMouseUp ()
    {
        Application.LoadLevel(1); 
    }

}

I’m not quite sure what your problem is, I mean, why do you want to do that?
you’re creating a android build, you don’t need a mouse!

for android touch input you can check out the API: Input.GetTouch();
and in Unity play mode the mouse click is treated as a finger touch.