General Contact Details. In this case we are filling the details for a company and so the signatory must be noted.

The client need to "Untick" the box if he wants the tax form to be sent to himself.

Note: for FOREIGN addresses State and Postcode are not required on tax forms (also not required to fill under Settings>Contact details). ATO requirement is that postcode is  maximum 4 characters long. Workaround for this kind of issue is to left empty the said fields (State and Postcode) and add this either Line 1 or 2.

Related article: 

Address Option - Tax Agent or Client Additional Email Address