To enable this feature, you must add this information to your Account Settings.
Navigate to the sidebar menu and click Account then click "Settings".
The Display will now appear quite busy with all the settings you can affect on your account. Scroll down the page until you see the setting header for "Invoices"
You will notice there is a blue Edit button in the top right corner, click this to alter settings for Invoices.
Afterwards, you can enter your bank details or PayID in the "Payment Terms" box.
These EFT details you put here will be included on your invoices.