Android to unity INPUT

Hi at all i made a game with flashlight. On pc version when you click Fusing UnityEngine; the flashlight turn ON. how can i do this on android? (when you click the flashlight turn on) this is the code

 using UnityEngine;
 using System.Collections;
 
 public class Flashlight : MonoBehaviour
 {
     public static float BatteryLife = 100;
     public static GameObject HeadlightMount;
     public AudioClip on;
     public AudioClip off;
 public Light HeadLight;
     public float BatteryReductionSpeed = 3.0f;
     private AudioSource audioSource;
         
     void Awake()
     {
         audioSource = GameObject.Find("headlamp").GetComponent<AudioSource>();
         HeadlightMount = GameObject.FindWithTag("Headlamp");
         HeadLight.enabled = false;
     }
     
     
     void Update()
     {
         if (HeadLight.enabled)
         {
             BatteryLife = BatteryLife - (BatteryReductionSpeed * Time.deltaTime);
         }
         if (Input.GetKeyDown(KeyCode.F) && HUD.HasFlashlight && !HeadLight.enabled)
         {
             audioSource.clip = on;
                audioSource.Play();
             if(BatteryLife <= 0 && HUD.BatteryCount > 0)
             {
                 HUD.BatteryCount--;
                 BatteryLife = 100;
             }
                 HeadLight.enabled = true;
         }
         else if(Input.GetKeyDown(KeyCode.F) && HUD.HasFlashlight && HeadLight.enabled)
         {
             audioSource.clip = off;
             audioSource.Play();
             HeadLight.enabled = false;
         }
         
         if(BatteryLife <= 0)
         {
             BatteryLife = 0;
             HeadLight.enabled = false;
             
         }
     }
 }