This is the URL of the page where people will be redirected to after confirming their email address, applicable only if you have email confirmation required for new directory submissions.

There is no template available for such a page (as it does not contain any functionality required for this application to run) so you will need to manually create your "thank you for confirming your email address page", upload it to your server and enter the location here. Once the submitter confirms their email address, they will then be redirected to the "thank you page" which you've specified in the previous setting.