To add footer note on invoice (also for statement, estimate, sales receipt and so on):
From the home page screen
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ul>
<li>Select Company “Gear” (upper-corner)</li>
<li>Select Company Settings under Settings header</li>
<li>Select Sales</li>
<li>Select “Customize look and feel” under Customize</li>
<li>New “Add personality to your forms” screen will open</li>
<li>Select “Footer”</li>
<li>Enter notes under Footer</li>
<li>Save</li>
See screenshot photo for reference
