Thumbnail no large view

Hello,

I was directed here by WordPress support.

The issue I’m having is the thumbnail in blog posts. It cant be clicked to open full view image.

Example found here: https://bygrace.faith/angelinajaade/psalm-91/

I want the thumbnails to be clickable to view large size. How can I change this?

Thanks, Angelina

The page I need help with: [log in to see the link]