How do i put my bank acct details on my invoice aswell as my ABN?

Hi jekim4-hotmail-c,

Thanks for posting in the Community! Let me show you how to add your bank account details and ABN on your invoice.

1. Go to Gear icon and select Custom form styles.
2. Select Edit on the Standard template. 
3. To add ABN, go to Content tab. 
4. Tick and enter ABN on the field provided. 
5. To add your bank account details, click on the pencil icon on the footer of the invoice.
6. Then enter Your payment details on the field provided.
7. Select Done. 

You can check on this article on how you can customise invoices, quotes, and sales receipts in QuickBooks Online. 

Let me know if you have any other questions and I'd be glad to help. Have a great day!