Giving a user account FTP access to your site means that you will allow anyone using this account to upload files to the particular area of your site you designate. To set up FTP access for a user account:
The user account now has FTP access to your entire site. To restrict this account's access to a particular section of your site, click the "Change Access Point" link in the right column next to that user name, under the "FTP Access Point" heading. On the following page, you'll be able to create a new directory or select a current directory. Click the "Choose Directory" link next to the directory to which you want to limit this user account's FTP access.