how can I implement navmesh in this script?

hi, I recently made this script with some help from a tutorial, but i would want my object to use navmesh agent instead of a simple transform, but i don't know a lot about navmesh... still learning

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

 public class WaypointPatrol : MonoBehaviour {
     public Transform[] waypoint;
     public float patrolSpeed = 3.0f;
     public float dampingLook = 6.0f;
     public float pauseDuration;
 
     float curTime;
     int currentWaypoint;
     CharacterController character;
 
     void Start()
     {
         character = GetComponent<CharacterController>();
     }
 
     void Update()
     {
         if (currentWaypoint < waypoint.Length)
             Patrol();
         else
             currentWaypoint = 0;
     }
 
     void Patrol()
     {
         Vector3 target = waypoint[currentWaypoint].position;
         target.y = transform.position.y;
         Vector3 moveDirection = target - transform.position;
 
         if (moveDirection.magnitude < 0.5)
         {
             if (curTime == 0)
                 curTime = Time.time;
             if ((Time.time - curTime) >= pauseDuration)
             {
                 currentWaypoint = Random.Range(0, waypoint.Length);
                 curTime = 0;
             }
         }
         else
         {
             var rotation = Quaternion.LookRotation(target - transform.position);
             transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * dampingLook);
             character.Move(moveDirection.normalized * patrolSpeed * Time.deltaTime);
         }
     }
 }