If you signed up for a DealMachine plan through Apple you would have to cancel your subscription from your Apple account otherwise please follow the steps below:
Open the DealMachine website from a computer browser and make sure to complete the onboarding or initial setup steps. (This part is important so you can access the Account & Settings page).
After completing the initial onboarding steps, go to the Account & Settings page by clicking the icon on the upper right corner of the page.
Click Plans & Licenses.
Click Cancel Plan at the bottom.
Make sure to follow the steps to completely cancel your account.
I hope this helps!
A kind reminder to reach out to our support team should you have questions or need help with anything.