Direction the index page for all the inviter

I don't know what code should be put to any persons who are unable to identify always redirects to the homepage.

Thank you very much.

Please explain in a bit more detail. You want non members to go to index.php of dolphin or an index.html you have built?

I built a page called index.html which is placed in the root of the Dolphin
People who do not authenticate or automatically redirects to this page
Thank you

you can help me