How to display text after collision?

How can I display a Text after I collided with a GameObject? I tried this:

Code (CSharp):

1.    void OnGUI()
2.         {
3.             guiStyle.fontSize = 66;
4.             guiStyle.fixedHeight = 66;
5.             guiStyle.fixedWidth = 66;
6.             guiStyle.normal.textColor = Color.white;
7.  
8.      
9.             GUI.Label(new Rect(10, 10, 100, 20), "Score: " + score, guiStyle);
10.  
11.             guiStyle1.fontSize = 200;
12.             guiStyle1.fixedHeight = 66;
13.             guiStyle1.fixedWidth = 66;
14.             guiStyle1.normal.textColor = Color.white;
15.         }
16.  
17.         private void OnTriggerEnter2D(Collider2D collision)
18.         {
19.             GUI.Label(new Rect(10, 10, 100, 20), "Score: " + score, guiStyle1);
20.         }
21.     }

 

i never create a UI by script. For something like this, create a canvas and Text item in the editr so u can set active or instantiate everytime u collide.
i dont have much of experience so there might be better ways though.

 

I have to create it via script because it has to display "score".