Add the following code to the theme functions.php file (or create a plugin for it).
Create a page in WordPress that the form should redirect to, and use the shortcode below in the page content.
- Replace the number
1with the form ID
Then go to Edit Form → Settings → Confirmations then to the settings for the Default confirmation. At the Type option choose Redirect to another page and choose the page you just created.
Adding a print button
To add a print button to the page, go to the Text tab of the page editor and enter the following code.