What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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When you create Autoresponder inside of Compose Email you can add text. You also have options there to align your text, change Font Family, Font size etc.
Inside of this article you can find out how to create Autoresponder:
Hope this will help. Let us know if you need further assistance.