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 could 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 & Add-ons.
Click Cancel Plan on the lower part of your screen.
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.