If you want to customize the content of the Thank You page where the form visitors are redirected after submission, click on Edit form. From the Form Configuration side menu, select the Thank You page icon.
Once there, go to Thank You Page and Redirects, click on the option Show HTML Block and an HTML Block will drop down. Here you can add different codding elements, images, text styles, form inputs, and videos. If you want to add a form input in the HTML Block, select the field in the dropdown list located on the top, and press the Add button on the right.
In the end, form visitors will be redirected to a Thank You page with the content you have customized in the HTML Block. The content will show up within the form’s layout, so if you have used the form headline box, it will also appear on the Thank You page.
If interested in how to embed videos in the HTML block, follow the steps from this documentation. To embed videos on the Thank You page, just hit Source code and paste the embed code there.
If you are familiar with editing notification email templates in HTML mode for your online forms, the HTML block of the Thank You page is not that different. All that you need to know is that all the content within the HTML block is displayed the same way within the layout of the Thank You page. The only significant difference is the form field, because here you see a code of the field, while on the Thank You page your form visitors will see their input.
Try out the options of the HTML block and see how the content is displayed on the Thank You page after submission.