Then you want to install the Search Banner theme-component
The settings for themes and theme components are located in the Appearance section of the admin sidebar:
There you can click Install, select “From a git repository” and add the repository link you find in the table in the topic about the component.
After installing, you can change the settings and translations.
I usually open the preview, because I can see the effect of my setting changes.
When you are satisfied with the settings, don’t forget to add the component to your theme.