While these steps will edit the default Invoice information, you can also edit what shows up for individual Orders.
On the left hand side, click "Admin."
Within "Admin," click into "Orders."
Scroll down and click the pencil icon to the Document Settings box.
Check on or off the Checkboxes next to what you would or would not like to show or type in the Customer Footer Note if you would like to override the default. Once the settings look correct, click "Submit" in the top right hand corner.