The Buttons Action allows you to branch or to set variables values or switches which can then be read by the Branch Action (Branch Action was was added in 1.0.1).
One of my videos goes over the GUI to show you which panels are related to the Dialogue. You simply change the textures for those elements to customise it for your game. You can even go as far as changing it totally, as long as you tell Vinoma GUI where to find the Text element for the Dialogue Text and the Text element for the Dialogue Name. Other, like the buttons, you can change too and still tell Vinoma when the button if called by adding the correct function callback to the button's click event. All shown in the video - see playlist I linked in previous post.