When you search for something on Google, two important things typically show up in each search result: the page title (which is also a link to that page), and a snippet or summary.
You can control what text is displayed by changing two fields in your Gachi Site:
The "Description" meta tag
To change the page title, typically all you need to do is change the title of your article. Sometimes there is a dedicated "Page Title" field.
To change the "Description" meta tag, looks for a "Meta Tags" section when editing a page, typically you will see two fields: "Description" and "Keywords". Google provides some tips on writing a "good" description.