Powerpal works with digital meters and cannot interface with the older "spinning disk" style meters.
If you have one of the old meter types without an optical port you can contact your energy retailer to ask for your meter to be upgraded to a smart meter - they are now legally required to complete the upgrade within 15 business days of your request:
https://www.aemc.gov.au/sites/default/files/2018-12/Information%20sheet.pdf
If you buy your power from one of the "big 3" energy retailers (Origin, AGL or Energy Australia) there should be no charge for this upgrade to be completed.