Log into cPanel (http://www.YourDomain.com/cpanel)
Go to ‘FTP Manager’ menu
Click on ‘FTP Accounts’
Click ‘Add FTP Account’
‘Login’ is exactly as your sub domain name.
Example: If your sub domain is support.xantec.com.my, enter ’support’ as login.
Enter Password.
Directory is your sub domain directory.
Example: /home/xanrec/public_html/support/
Click ‘create’ to add this sub domain FTP user.

NOTE:
If you enter a single / in the directory box, [...]