How to Save/Load state

Hi,

I cannot achieve to save/load state of my ink stories. I have used inky to write my story, and integrated it in Unity 3d, with the blot example. Everything works fine, but I don't know how to save/load the state of the game.
In the manual says:

_Saving and loading
To save the state of your story within your game, call:
string savedJson = _inkStory.state.ToJson();
...and then to load it again:
_inkStory.state.LoadJson(savedJson);_

But I don't know what to do with it. Do I have to create a script?

Sorry, I don't know anything about programming, but it's the last thing I need to finish my project and don't make the player to start all over again everytime he runs the game.

Thank you very much.

JL Lopez Morales