FTP login details are provided in your 'New Account Information' email.
Typical FTP settings;
Username; your plesk username
Password; your plesk password
The root directory for your website is the 'httpdocs' directory.
Files uploaded to your website go in the directories at; httpdocs/content/
You can download a free FTP client from; http://filezilla-project.org/
More info about FTP; http://en.wikipedia.org/wiki/File_Transfer_Protocol
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