You see, create a script in Unity to get out of the game, but, I had to add it to the OnClick event and when I looked for it I did not find it, does anyone know if something should be activated or add a script? Could you leave it here? I leave you an image just in case, I hope it was clear, thanks: /
PS: I'm using Unity 2018.2.13f1 in 2D mode
DSRaptor, in addition to the answer of cmanzo there is something missing:
To add functions to your buttons, you must drag a object that contains the script. Therefore, you must drag to onClick() of your button an object that has your script with the function you want to use.
I think you mean add it to a button ... create a button (inside canvas), inside the button will be the OnClick event, that's where you should add it.