UI
Narrative Interaction comes with a UI widget to handle displaying the current interaction info to the player. It can be added to your existing UI to keep it nice and clean.
Creating your HUD
To set up a simple HUD, open your Content Drawer, right click -> user interface -> Widget Blueprint and name this WBP_HUD
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note
If you already have an existing HUD, add it to that. It's much better for performance than having multiple HUD's rendering.
Open the HUD and add a WBP Interaction Widget. Align this however you want to.
Finally, go back into your Player Controller, and on begin play, create the widget, promote it to a variable then add it to the viewport.