Auto Responders are the emails which goes to the email of the form submitter. 

To configure your Auto Reponder Email, follow the following steps.

1. Login to your formX Console

2. Navigate to your form where you want to add the auto responder email, using the switcher on the top left of the screen.

3. Go to Settings Tab

4. Choose the Auto Responder sub menu

5. Toggle Email AutoResponder On

6. You can customize the message below in the text box.

There will be a list of merge tags available below the text box itself.

Note : Surround the merge tag with {{ and }}.

Example : To use name tag, {{name}} will do the trick!

Quick GIF for reference,

Note : We by default take the first form field with name attribute set as name="email" as the submitter's email.