If you're on a paid Clipchamp plan and would like to cancel the subscription, please see https://help.clipchamp.com/hc/en-us/articles/223078187-How-do-I-cancel-my-plan-.
To permanently remove your account altogether, you can do so in your user profile at https://clipchamp.com/en/profile - there's a "Delete Account" section at the bottom of the page.
1) Click on "Delete my account"
2) Follow the prompts
After deleting your account, you'll have to get in touch with us should you ever like to create another Clipchamp account with this email address in the future.