If you want to delete an FTP account, you can accomplish it by following this tutorial.
Steps to delete an FTP User Account From cPanel
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Log in to your cPanel account.
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In the Files section, click on FTP Accounts.
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Under the FTP Accounts list, choose Delete.
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Click on Delete once again to confirm and remove the FTP account.
Warning: Do not use the Delete the Users Home Directory option. Otherwise, the data inside your FTP user account will also be deleted and will become unrecoverable unless you restore it with a backup.
