To set up Neto your will need a Neto login.
Firstly Log into Neto normally at https://www.<yoursite>.com.au/_cpanel
In your Neto Control Panel, go to Settings & Tools > All Settings & Tools > API Settings
Get the APIKey for the user you are logged into
Fill in the information below
Store URl = https://www.<yoursite>.com.au/do/WS/NetoAPI
UserName you used to generate the key
ApiKey from above
Note the Advanced Setting for TaxCodes must also be set in the following way as Neto does not return this information. Add in the required tax codes.