[Plugin: Absolute Privacy] Alloce home page access to non-registered users

Currently setting up a new website which needs to have a private forum. I’m using Simple:Press and have just activated the Absolute Privacy plugin and its “Lock Down” option so all users have to register and be approved before they can post.
I’ve listed the page IDs for all pages that will be accessible to non-registered users and want this list to include the home page. Unfortunately I can’t locate the page ID for the home page so haven’t been able to list it with the other allowed pages.
Does anyone know how I can ensure the home page is accessible by non-members?