How to cancel the subscription without paying cancellation fees for acrobat pdf editor?

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You have taken an annual subscription instead of the more pricier monthly subscription. To cancel an annual contract paid during the month, Adobe asks for half of the remaining dues as an early termination fee. To avoid this fee, you need to cancel your annual subscription for the last month. That's part of the terms and conditions that you did accept.

You may try contacting Adobe customer service and negotiating a cheaper exit. Adobe customer care can be contacted by beginning a secure chat session at helpx.adobe.com/contact.html. Pop-up blockers need to be disabled, and you need to accept cookies! If the chat window fails to open or is non-responsive, use a different device and/or browser to start the interaction.

For support via Twitter: https://twitter.com/AdobeCare

(see also here: https://community.adobe.com/t5/creative-cloud-services/how-to-contact-adobe-support/td-p/11875703 or here https://community.adobe.com/t5/account-payment-plan/how-to-contact-adobe-support/td-p/11843852)

Important: Adobe does NOT contact you unsolicited by e-mail or direct message. If you get contacted by direct message from someone claiming to be an Adobe employee, look at that profile and check if they bear the “Adobe Employee” marking under their name. Adobe support does not use Skype to give you support.
If in doubt, ask the forum.

Are you sure you've come to the right place? Because Editor is software published by Foxit, not Adobe.

In any case:

This is a public forum, not Adobe support. Users, including the Community Experts, can't provide support for account, subscription, billing, download, or product activation issues. Support for those issues requires an Adobe employee.
Adobe provides support through the Chat function on the contact page, through a phone call, or through Twitter.
There is no email support, so beware of scammers.