To cancel a Hulu subscription, the main and simplest way is to do it through the Hulu website by following these steps:

1. Sign in to your Hulu account at the Hulu website.
2. Click on your profile icon in the top right corner and select "Account".
3. Scroll to the "Your Subscription" section and click "Manage Plan".
4. Click the "Cancel Your Subscription" button or link.
5. Hulu might offer you options to pause or get a discount; if you want to cancel, proceed by clicking "Continue to Cancel".
6. Confirm cancellation and wait for the confirmation email from Hulu.

Your access to Hulu will stay active until the end of your current billing cycle after cancellation. If you subscribed through a third party like iTunes, Roku, or Amazon, cancellation must be done through those services. This process can also be done on the Hulu mobile app with a similar flow via your account settings. No refunds are typically given for partial months, and you can also pause your subscription instead of canceling if desired.