LodgeiT

You can find it in the lower portion of the "Company" tab of the company tax return.

You either input the details manually or add the public officer as a client (Add Client guide) in LodgeiT and search its name in  the "First Name" field (see image below with name "Curry").

ATO Link: https://www.ato.gov.au/tax-and-super-professionals/for-tax-professionals/your-practice/tax-and-bas-agents/primary-contact-and-authorised-contacts