First, you need to find out when "The Voice" airs in your area. Then, at that time, you can go to the NBC Live Stream website to watch the show as it airs.
You will need to have your cable provider login information to watch "The Voice" on NBC Live Stream. When you go to the Live Stream website, click on your correct cable provider, and enter the username and password you use to log into your cable provider's website. Once the Live Stream website verifies your user information, you will be able to watch NBC live from your computer or mobile device.