To enable this feature, you must add this information in your account settings.
Navigate to the side bar 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.
You can now enter your bank details or PayID in the Payment Terms box.
These EFT details here will now be included on your invoices.