My Code

using UnityEngine;
using System.Collections;

public class ClickToMove : MonoBehaviour
{
    NavMeshAgent navAgent;
    //The Start is just grabbing the 'NavMeshAgent' to the code
    void Start()
    {
        navAgent = GetComponent<NavMeshAgent>();
    }
    //Update means what you do to change what happends. Like Clicking for example! :D
    void Update()
    {
        //This part sends a line from the mouse to the terrain to make your character move
        RaycastHit hit;
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        //The mover is assigned to the left click on your mouse, just like any MOBA game out there
        if (Input.GetMouseButtonUp(0))
        {
            //The 100 states that your mouse can send a line up to 100 units, no farther than that.
            if (Physics.Raycast(ray, out hit, 100))

            {
                //Debug means it just sends it to the console, pretty much makin' sure that it works, It
                //sends the position u clicked on the terrain to console to see where you are clicking at
                Debug.Log(hit.point);
                //These Brackets at the very end here close all the statements so nothing interfear with it!
            }
        }
    }
}