New Zealand citizens with a valid New Zealand passport don't need to apply for a visa before coming to Australia. When you enter Australia, you are provided with a visa TZ/444 that has no expiry date.
To bypass this section on your onboarding form, you will need to select "I am a visa holder" and input TZ/444 with an expiry date of 10 years time.
We will always double-check your legal right to work in Australia, update the visa information & visa expiry date within our system, and will be in touch with you if we have any further queries.