On getting the activation code, visit the Hulu Com Activate page.
You will be redirected to https://secure.hulu.com/activate
Now, login to your Hulu account.
Next, choose Roku from the list of available device options.
Finally, enter the activation code or the link code.
Select continue.
After a few minutes, you can start streaming the contents of the Hulu app on your Roku streaming player.

For further assistance on how to activate Hulu, call our customer support team anytime at +1-844-885-8900. or visit https://www.hulu-com-activate.com/hulu-error-codes/