Quickstart
Add an empty GameObject with the component DialogueManager to your scene and assign its required references.
Add a button, give it the SingleInteraction component, and assign its reference to the DialogueManager.
Assign the button component's callback to DialogueInteraction.StartDialogue.
For the Interaction Dialogue reference, create a new Ibralogue file from the create menu like so:

...and then assign it to the Interaction Dialogue reference.
Open the Ibralogue file you have created and it should look something like this:
{{DialogueName(Init)}}
[NPC]
Hello World!