Summary Excerpts

I am trying to have my blog posts only show a summary just like demo theme for Ellie. But after multiple tries, it still not showing as a summary only full for the whole post. The Blog Options & Content Options tab do not show a “Blog Display for post excerpts”. I also went to Settings on my dashboard and click on Reading settings and summary for “For each post in a feed”.

Can someone help figure out why?

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