When I fill out a form and submit it, the thank you message shows up on the webpage where the form orginally was.

How can I make this thank you message come to my email address like it used to?

I'm not sure if understood your question, there is a thank you message that is shown when the form is submitted, and there is an email notification that can be set to receive user's answers. 

This guide should help you to set up an email notification: Setting-Up-Email-Notifications

May we get more details about what are you looking for?

If possible, please share us the link where your form is embedded on, we will be glad to take a look.