Save text changes

I am new to Unity and not a programmer/developer. I purchased a source code and I'm trying to make changes to text and graphics. When I click play and run the game, as I advance through the game I have access to text items under the hierarchy that when clicked can be changed in the inspector. Since I cannot save the changes while the game is running, the text changes I made are lost. When the game is not running, I do not seem to have access to these same text items to make the changes nor are they found when I search within Unity or MonoDevelop. How do I change these text items and save the changes? The game uses NGUI.