Sign in to myGov, select Services, then choose Centrelink and follow the prompts to link the service. You may need your Centrelink Customer Reference Number (CRN) and details from an identity document or recent Centrelink letter. If you do not have a CRN, contact Services Australia to discuss how to set up or access your account. For security, use the official my.gov.au website or the myGov app, and contact Services Australia if you cannot complete the linking process.