Giving Guests Access to Upfront (Spirit) Front Page with Memberships

Hello,

I've created a 'Guest' user level on memberships. I'd like to give guests access to my front page on upfront (spirit theme). However, when I logged out and viewed my site as a guest, memberships sent me to the 'blog' page as a default.

How can I change this so that my default (index) page is my spirit front page? I want to make sure that guests have full access to this. I don't see a 'front page' or 'index' category listed under the memberships pages that I can give guests access to.

Thanks in advance!