How do you get VR on Roblox VR?

How do you actually get VR functionality on Roblox VR? I've heard it's a great way to immerse yourself in the game, but I'm not sure where to start. Do I need a special headset? Is there a specific app I need to download? And once I have everything set up, how do I actually activate VR mode in the game? Can you walk me through the process step-by-step? I'm really excited to try it out and want to make sure I do it right.