For the PRO accounts, the account owner needs to go to the Subscription tab to downgrade or close the account. There are two options:
downgrading the account to the free version (the 'Downgrade to free' option)
or closing it completely (the 'Cancel subscription' option)
*** Please note that once you select the 'Cancel subscription' option, your subscription will be canceled immediately and you will lose access to the account. If you wish to cancel your subscription before the next renewal (and keep your access meanwhile), contact us at [email protected].
The free accounts can be closed by the account owner in the Account admin tab: