how to change the value of my slider(in the inspector) thanks

because in the script that i wrote it has a fix value and i want my slider to become changeable. sorry for my english grammar i hope you will understand me. someone can help me please?

 using System.Collections;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class MeterManager : MonoBehaviour
 {
     public Button[] buttons;
     bool GameOver;
     int meter;
 
     public Slider meterSlider;
     public uimanager ui;
     public GameObject MC, Text, Ok;
     private carcontroller car;
     // Use this for initialization
     void Start()
     {
         MC.SetActive (false);
         Text.SetActive (false);
         Ok.SetActive (false);
         car = FindObjectOfType<carcontroller> ();
         GameOver = false;
         meter = 0;
         InvokeRepeating("meterUpdate", 1f, 1f);
     }
 
     // Update is called once per frame
     void Update()
     {
         meterSlider.value = meter;
 
         if (meterSlider.value >= 10)
         {
             gamecontroller.MoneyAmount = 120;
             Destroy (car);
             Time.timeScale = 0;
             MC.SetActive (true);
             Text.SetActive (true);
             Ok.SetActive (true);
         }
     
     }
 
     void meterUpdate()
     {
         if (GameOver == false)
         {
             meter += 1;
 
         }
     }
 
     public void Gamestart() {
         GameOver = true;
         foreach(Button button in buttons)       {
             button.gameObject.SetActive(true);
         }
     }
 }