For the 1st time ever, i lodged my share trading GST on-line via...

For the 1st time ever, i lodged my share trading GST on-line via My Tax

just use the 'tax return' button and find 'activity statements'

https://www.ato.gov.au/Individuals/Lodging-your-tax-return/Lodge-online/

that was quick

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a share trader registered for GST can have refunded 75% of the GST paid on brokerage and that's about it

they can't refund back other GST such as when buying a new computer

the other 25% of GST is claimed as a tax deduction (expense) in the annual income tax return

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