To contribute to your super as a self-employed person, simply:
To claim your personal contributions for tax purposes, you need to complete the Notice of intent to claim or vary a deduction for personal super contributions form. You'll need to do this once per financial year for all the contributions during that financial year.
You have one year from the end of the relevant financial year within which to submit your notice of intent.
For more information, this blog article contains a handy guide to making personal contributions to your Future Super account.