Create a myGov account using an email address, then sign in and choose Centrelink from the available government services. You will generally need a Centrelink Customer Reference Number (CRN) and a linking code, or may be asked to verify your identity before the service can be linked. Once connected, you can view messages, check payment details, report income and upload documents online. If you do not have a CRN or have trouble linking Centrelink, contact Services Australia or check the guidance at servicesaustralia.gov.au.