You need to have a Centrelink online account and myGov account to use the app.
If you don’t have a Centrelink online account and myGov account, you’ll need to set them up. You’ll need your Centrelink Reference Number (CRN) to register for an online account.
You’ll then need to link your Centrelink online account to myGov. You can use the myGov online help guides.