how can we use SceneManager.LoadScene from an ui button click?

hi everyone! this is a question from a newbie, and i'm struggling a lot finding simple tutorials or working examples showing how can we use SceneManager.LoadScene from an ui button click - let's say we want some few scenes, like 3, with buttons for going to another scenes, as simple as this - do anyone know where from we start and have something simple working? thanks in advance!

 

Instead of setting the text you call the scene loader.

 

thanks, it's working now! - https://gitlab.com/nitrofurano/unitysandbox/tree/master/2019v3/LoadsceneFromUiButtonClickTest