If you choose options 1 or 2 above you can file your completed Application by post or hand at your nearest Federal Circuit Court registry.
You also need to pay a fee or you may be eligible for a fee reduction. You can apply for this by filing an Application for reduction of payment of divorce or decree of nullity form. Current Court filing fees can be found at: http://www.federalcircuitcourt.gov.au/wps/wcm/connect/fccweb/forms-and-fees/fees-and-costs/fees-fl/family-law-fees
Please see Part 1 of 3 Articles to find out in more detail who can apply for Divorce and whether to file a joint application or sole application.
Please see Part 3 of 3 Articles to ascertain how to serve the Application for Divorce, details relating to the Hearing and when the Divorce will be granted.