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To customize these templates, click on one of them and that will take you to the Email Template screen. I'll click on the "New Appointment email sent to STAFF" email category:
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From here, click on the "Customize this email" button, and then you'll be able to add additional content, remove content, or even add in new email tags that dynamically add content to your emails or texts.
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I've added additional text to this email category. Once you've added the text and customized it to your liking, click the "Save" button.
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And you'll be taken back to the "Emails/Text to Staff" screen.