If you plan on lodging your own tax return using myTax, you need to make sure you have a myGov account and link that account to ATO online services. You can create your myGov account at my.gov.au.
To lodge online, you will need a myGov account and then link it to the ATO. There are videos available on the ATO website showing how to lodge. There is also Tax Help, a free and confidential ...