The easiest way to activate a new device is by downloading the Hulu app and logging in with your email address and password. If you’re using a Smart TV or TV-connected device, you may have the option to activate the device online instead.

To see this working, head to your live site.
How to activate a new device
Launch the Hulu app.
Select Log In on the Welcome screen, then choose Activate on a computer.
Go to your Account page (log in if prompted) and look for the Watch Hulu on Your Devices section, or head directly to hulu.com/activate.
Regards,
Willjoe