Once someone has registered using my form is there a way to say thank you

once they register they are getting a blank screen is there a way to add information the page?

Hi,

My apologies, we had an issue earlier with thank you pages not saving correctly.  If you edit and save your thank you page once again, it should then show properly:

No need to make any changes, simply click edit, then save it again immediately after.

Here is my test form with the thank you page updated:

https://form.jotform.com/53336133663958

When the form is submitted, the thank you page is now displayed.

If this does not work for your form, let us know and we will be happy to have another look.