Open up Netscape Communicator, select Edit from the menu bar and select Preferences. Under Category, double click on Advanced and click on Proxies. You should now have a screen that looks the very similiar to the below screen.

You should click on Automatic proxy configuration and fill in the configuration URL as http://www.fl.net.au/confproxy.pac (as shown below).

You can now click OK and your web browser is now configured to use First Link's proxy server.