Leave blank the FTP Directory field, and chose: Use Passive FTP
After this you will be asked for your username and password, the user name is different from the one to login on bravenet site, you can see it on the FTP section, I think are just numbers. The password is the one you registered.
Do this if you have the Frontpage, I guess is the same for Dreamweaver and others.
To use the Java FTP you need to download the Java Virtual machine, it downloads automatically when entering the page just enable the ActiveX support if its disabled or blocked.