You can cancel your account directly from the App, in the Login / Welcome page; selecting the "delete account" text will start the account deletion procedure.
If you are in the App, you can delete the account directly from the specific "Account" submenu in the hamburger menu in the upper left area of the App.
NOTE: Following cancellation of the account, in the following 30 days it will not be possible to register a new one using the same email.