Upon logging into your account, you are restricted to only your account and cannot move outside of your account.
When you log in, you are in what is known as the "root" of your account. In here there are several miscellaneous files and directories, all of which are important but none of which should be altered or renamed. In short, do not edit or change these files.
The only files and directories that you should edit or change are the "www/html" directory, the "www/cgi-bin" directory, the "ftp" directory, and the "log" directory.
The "www/html" (mainsitehtml) directory is where all of your files pertaining to your website should reside. Uploading files into the "root" of your account will mean that no one will be able to access them via the web.
The "www/cgi-bin" (mainsitecgi) directory is where all of your files pertaining to any cgi scripts should reside.
Uploading files into the "root" of your account will mean that no one will be able to access them via the web.