For more details on using response templates, read this article.
Response templates let you customize the responses your applicants receive at various points in the review process, such as when their application is received and when it has been accepted, declined, or completed. They are a flexible, highly customizable tool that lets you create templates that meet the exact needs of your process.
In the top navigation bar, click More, select Configurations. Then, on the left side of the page, select Response Templates.
Submittable provides by default a generic response template for when a submission is first received, as well as accepted or declined. You can edit these default templates by selecting Edit on the right. You can also create new templates by selecting Create a response template.
For more details on how to use response templates, including a description of each placeholder tag, please read this article.