You cannot delete the main FTP account but you can delete additional FTP user accounts you created.
Login to your DirectAdmin account.
In the
Account Managersection, click on theFTP Managementicon or type “FTP Management” in thenavigation filterbox. The option will appear. Click on it.
Under “Account”, choose the account you wish to remove.

Click on
Delete. A “Confirmation Prompt” will appear. Click onDeleteagain.
Your FTP user account will be successfully removed.