In Feburary 2016 27,
Select the 'Web Options' button on the control panel for the web site.
Choose the Sharepoint domain that represents the website on the control panel and left click the 'Web Service' page from the menu tabs. On the Web Services page, select the 'Edit' button on the user interface.
Select the 'Add New Assignment' menu option from the program menu and left click an existing windows subaccount from the menu.
Choose an FTP subuser on the next menu and then enter a 'Nickname and Email' to use the FTP services and select the 'OK' menu button. The Sharepoint now has an FTP server configured.
In Feburary 2016 27,