Hey @Tenshii! Welcome to the forums!
So, on the interactable actor, you need to add a widget component.
You’ll want to download the image you want to be displayed.
Next you will set that image as the texture for the widget, and you’ll want to place that where you’d like using the viewport.
Once you have it set where you’d like, click on the widget component and go over to details, and check “Hidden In Game”.
Then, once you get within the collision (which I assume you have in place for the interact button), Enable Visibility on the widget “TRUE”, and using OnCollisionEnd use another Enable Visibility node and set it to “FALSE”.
Hope that helps! 