Unity 2D - Text UI and Textbox scripting issue - HELP ASAP!

Hi, I'm new to Unity, coding and game development. I was trying to make a textbox system, and something isn't working, and it's not allowing my .txt file lines to be written in the Text UI object. It's just displaying default text, and not displaying what I wanted... Please help? :)

I cannot figure out what is wrong... :(

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class TextBoxManager : MonoBehaviour {
 
     public GameObject textBox;
 
     public Text theText;
 
     public TextAsset textFile;
     public string[] textLines;
 
     public int currentLine;
     public int endAtLine;
 
     public PlayerController player;
 
     // Use this for initialization
     void Start () 
     {
         player = FindObjectOfType<PlayerController>();
 
         if (textFile != null) 
         {
             textLines = (textFile.text.Split('\n'));
 
         }
 
         if(endAtLine == 0) 
         {
             endAtLine = textLines.Length - 1;
 
         }
 
     }
 
     void update()
     {
 
         theText.text = textLines[currentLine];
 
         if (Input.GetKeyDown (KeyCode.Return)) 
         {
             currentLine += 1;
 
         }
     }
 }