Navigate to the Invoices board and click the 'Show menu' button as highlighted below.

Click the 'Show Menu' button to reveal the 'Board Menu.'

Click the 'Settings' option to open the board settings as shown below.

Scroll down to the 'Invoice Terms' section of the settings as shown below.

Here you can add bank details to your invoice terms and set a validity frame for your customers to make a payment.

When you are finished setting your terms, click the 'Quick Save' icon as shown below.

Your bank details will now show on all invoices.