It is ok that you can not access the websites from a user account named "administrator" as this user has no admin permissions on a Linux system. The user that is able to access all files in linux is named "root" and not "administrator" like in windows. If you want to access the sites without using the ssh user of a site, run:
and when you run then:
you will be able to access the data of this website.
To be able to help you with the FTP access problem, answer my questions from post #2.