how to add script to text mesh pro in unity code example

Example 1: change textmesh pro text

using UnityEngine;
using System.Collections;
using TMPro;

public class ExampleClass : MonoBehaviour
{
    void Example()
    {
        TextMeshPro textmeshPro = GetComponent<TextMeshPro>();
        textmeshPro.SetText("The first number is {0} and the 2nd is {1:2} and the 3rd is {3:0}.", 4, 6.345f, 3.5f);
        // The text displayed will be:
        // The first number is 4 and the 2nd is 6.35 and the 3rd is 4.
    }
}

Example 2: unity get textmesh pro component

GetComponent<TMPro.TextMeshProUGUI>().text