Privacy options in Social Theme


I am using the social theme.

I have a static page selected (home).

I’m wanting users to not to be able to navigate through the website unless they register.

I am thinking of creating a page entitled “Welcome”

This page would have the the into header and the video that I have in the intro header.

But how do I make this “welcome” page the page that non-logged in viewers go to? And how do I stop non-logged in users from visiting other pages?

Thank you!

My website is