Submissions on Mobile form requests for users to sign in

Is this an App for non users which is open to EOTI?  Everyone On the Internet?   So, typically what we would recommend would be contriving a way that when the button is pushed to add a record than that URL formula Button would have a syntax to redirect the user to a thank you page.  Or else the Submit button you created would navigation to a Thank you page.  Can you give us more details about what process the user goes through to add a record or to submit.  Can we see your code for the button?