Change "This report is not accessible." page

Change "This report is not accessible." page

Hi all,
I have a public form that, on edit, will send an email notification.
This all works fine. 
When I click submit, though, I get sent to the "This report is not accessible" page.

I don't want the user to see the reports, but I also don't want them to see this page.
How can I direct them to a page that just says "Data Entry Successful"?

Thanks in advance!
Levi