How do I asign this script to a button successfully?

I have a script on a card gameobject that works perfectly if i place an event trigger to click on the card, it will then randomize it's heirachy amongst other cards in the deck area. I want to now shift this function onto a UI button, so when i click the button it perform the action when the card is in the deck area.

this is the current script on the gameobject:

 public class ShuffleDeck : MonoBehaviour
 {
     GameObject Deck;
     public bool isShuffleable = false; 
     int indexNumber;
 
     private void Start()
     {
         Deck = GameObject.Find("Deck");
     }
    
     private void OnCollisionEnter2D(Collision2D collision)
     {
         if (collision.gameObject.name == "Deck")
         {
             isShuffleable = true;
         }
     }
     private void OnCollisionExit2D(Collision2D collision)
     {
         if (collision.gameObject.name == "Deck")
         {
             isShuffleable = false;
         }
     }
     public void Shuffle()
     {
         indexNumber = Random.Range(0, 10);
         if (isShuffleable)
         {
             transform.SetSiblingIndex(indexNumber);
         }
         
     }
     
 }

Thanks in advance :-)