FTP is an insecure protocol and is disabled on the OIT WebHosting Service. However, users can still use SCP (secure copy) and SFTP (secure-FTP) to transfer files.
You will need to know your the GT WebHosting Account and password for the site you want to access. This account name is unique for each site and can be managed via your site's control panel (via http://hosting.gatech.edu).
A unique account is associated with each site that will only be used within the WebHosting environment. Unfortunately, you can only have one username and password per site. If additional people need access, you can choose to share your GT WebHosting Account and password with them. Conversely, if you need to take away access, the only way is to simply change the password. This is a limitation of the system, not an OIT policy.
On your mail Parallels panel, click the "Show More" link:
Click the icon for "Web Hosting Access":
You can view your GT WebHosting Account username on this page (it cannot be changed) as well as modify the password.