Test
Drag BP_InteractableButton into the ThirdPersonMap
Drag BP_InteractableRespondentLight into the ThirdPersonMap
With the Light selected, add an Activator and pick the button from the viewport with the eyedropper
Press Play and walk in front of the button, you should see an interact text. When you press E, the button will turn green and the light will turn on.
Drag BP_InteractableOverlap into the ThirdPersonMap
With the Light selected, add another Activator and select the Overlap with the eyedropper
Now, the overlap and the switch will interact with the light
With this knowledge, you should be able to create most interactables you need within your project