Once a user has submitted your form, they'll end up on a "After submission" page. Per default that looks like this
You have the ability to perform some basic customizations on this page, like changing the background and text color. This can be done by going to the "Settings" tab
If you click Save at the bottom and click on "Preview submission page" you can see what the page looks like
As you can see, it's possible for you to insert HTML like links or images and to display submitted values to the user.