Help with using Oculus Rift Hand Controllers to click buttons in Unity

For a class, we're designing a VR/AI program using IBM Watson, Oculus Rift, and Unity. We have two Oculus Rift hand controllers, and I need to figure out how to use them to click buttons. I know how to get the hands themselves set up, but I really just need help with buttons, and I can't find any information on the subject. Any help would be insanely appreciated. I have to finish this by Thursday afternoon, so I can only work on this today and tomorrow morning, and I'm so confused. If any advice seems too simple or obvious, it's not. I'm an idiot. Please help me. Please.