here's the form for travellers registering VAST tv for the first time, you can also do this by phone 1300 993 376 make sure you have your dish set up and tv on before phoneing.
http://www.mysattv.com.au/travellers.aspx
here's the form for travellers re-registering every 6 months
http://www.mysattv.com.au/Cert_Renewal.aspx