Populate the certificate that sends as a PDF to the person that submits the form

I am trying to make this form populate the certificate that sends as a PDF to the person that fills it out. How do I get the PDF to send when they fill out the form and not send the submission itself. 

Under the Advanced tab of the email autoresponder settings in your form, select the PDF document you would like to send as PDF Attachments that your respondents will receive.

Please give it a try and let us know if you need any further assistance.

Great thanks! Got it. Also I am trying to see if I can change the colors of the form in the email that people receive. For example can I make it blue not orange? 

If you mean you want the PDF Document to have different background colors, you can do it via the PDF Editor:

No I mean the way that the emails look when re recipient who fills out the form gets the form. Is there a way to change the jotform orange?

For changing the email template styles, kindly refer to this documentation:

Guide: How-to-Edit-the-Email-Template-for-Notifications-and-Autoresponders

Let us know if you need any further assistance.