To upload your files with FTP you will need an FTP client.
User name and password are the same as the PLESK.
Upon connecting, you will see a list of the following directories:

• anon_ftp
  This directory is used for anonymous ftp upload/downloads.


• cgi-bin
  A directory for your cgi scripts.


• error_docs
  This directory holds the html error pages that you can customize for your needs.


• httpdocs
  This is the root of your website where you should put all website related files.


• httpsdocs
  This is the SSL secured root of your website (https://), Of course if in the setup section of your hosting you ticked "Use a single directory for housing SSL and non-SSL content" then everything should be stored in httpdocs and you simply use http:// for normal connections and https:// for encrypted connections.


• private
  This folder is for storing personal and private files and cannot be accessed by people using your website.


• statistics
  This directory is used for storing web statistics and logging information of your website and ftp service.


• subdomains
  This is used for the subdomains of your website, Eg. subdomain.ec2biz.com.


• web_users
  This directory is for webusers you created in your plesk desktop.

The httpdocs is where your web page files has to be placed.

DO NOT delete ANY directory or files that have been created by the system, otherwise your web site may disappear into cyber oblivion!