This article walks through how to set up a submission event to send an email to the submitter of a form.
Instructions
(Optional) Create an Email Submission Template

Click the plus sign next to the Email Addresses field

Select the Email Address Submission Metadata to pull the submitting user's email address

Note:
This will only be available if the submitting user has logged in. Learn more about Submission Data Injection.
(Optional) Toggle on the Use email template option and select the template you created from the dropdown

Click Save

When a user submits the form, they will now receive the templated email

