How to make a Score GUI.

Hi I am making a simple 2D soccer game in Unity. It is my first "game". I am wondering how to make GUI Text display the score I have. I already made the scores so when the ball goes in the net it adds one to the score. Well that's all great and all but now I need to know how to display it. The problem is that the scores are in the net scripts and I am making a score script to display the score. How do I access the variables I made in the other script? and how do I make GUI text display the score variables.