The Java SFTP applet should start automatically. (The first time it tries to run, you may be asked to give it permission.) Click the Connect button at the bottom, then enter your username and password when it asks you.
Java Secure FTP Applet 3.0.4 from JSCAPE. The license allows this version to be used for non-commercial purposes. You may want to read their Secure FTP Applet Documentation.
