If you want to remove an FTP account, you need to take the following steps.
1. Log into your cPanel account.
2. In the "Files" section, click on the "FTP Accounts" icon.
3. Under the "FTP Accounts" list, click on the "Delete" button.
4. Click on the "Delete" button and your FTP account will be removed.
Warning: Do not use the "Delete the User's Home Directory" option. Otherwise the data inside your FTP user account will be also removed and will be unrecoverable until you restore it from a backup.