Blix Theme: Excluding Sub-Pages

I am using the Fixed Blix theme for my blog: https://loveardently.com/blog and I’m trying to exclude a subpage from appearing on the navigation bar. You can click the link above to visit my blog and see what I’m talking about. I’m trying to exclude “Jessica and Jeff” page (which is a subpage) from the nav bar.

Any helps are appreciated. Thank you!!!