Help adding FTP User

I am trying to add an FTP user to one of my domains. When I create a user, they automatically are granted access to their own directory via FTP, but I can not find a way to grant them access and read/write permission to another existing directory.

Any help would be appreciated.


Not so easy, but doable using SFTP:

Of if you just want them to have their very own directory on your site without your needing to access it: