Redirect on Submission / Why Do I see Blank White page after Submitting the Form

When I submit my form, all I see is a plain blank white page.  How can I redirect to a thank you page or show a message?

The Post Submission Actions are included within your autoresponder profile(s). You need to set up an autoresponder profile and define a redirect url to go to a thank you page hosted on your site or server or you can use our built in Post Submission Thank you page. These settings are all part of the autoresponder profile for your form. If you are seeing a plain blank white page upon form submission, then this indicates that no autoresponder is set up. To learn how to set up an autoresponder profile see the following resources:

AutoResponder Quick Start Guide 

http://www.logiforms.com//helpfiles/quickstartguides/AutoResponders.pdf