Hulu.com activate a new device on Hulu is a straightforward process, and you have multiple options to do so. Here's a guide on how to activate a new device using an activation code:

Launch the Hulu App: Begin by launching the Hulu app on your new device.
Select Log In and Get Activation Code: On the Welcome screen, select "Log In." If you're using a computer, choose "Activate on a computer." You'll then be presented with an Activation Code.
Access Your Hulu Account: Go to your Hulu Account page on a web browser (log in if prompted). Look for the "Watch Hulu on Your Devices" section, or visit hulu.com/activate directly.
Enter the hulu.com activate my device: Input the unique code displayed on your TV screen into the designated field on the website.
Complete Activation: After entering the code, within about 30 seconds, you should be logged into Hulu on your new device.
Whenever a new device is activated on your account, Hulu will send you an email detailing the kind of device activated, where it was activated (city, state, country), and when it was activated. If you don't recognize an activated device, follow the steps provided to remove it. Additionally, consider resetting your password and/or changing your email address for security purposes.

Please note that some devices may not require an activation code. In such cases, you can activate the Hulu app by simply logging in with your email and password.