If you don't have a 'computer' option in your start menu, you may have classic mode enabled.
Try double clicking the 'Computer' icon on your desktop, or launch the run dialog and type 'explorer' and then click 'OK' (or press enter). The run dialog can be started by clicking start->run, pressing [winkey+r] on your keyboard, or typing 'Run' in the Vista/7 Start Search.
If you do not already have a copy of FileZilla, you can download one for free at http://www.filezilla-project.org/
HTML Index files should be named: index.html or index.htm
FTP Upload Test: The upload was successful!