The website uses a recipe of "Title | Business Name". If you want to override that recipe, you can do that here. Most commonly used for the "Home" page. (This title is what appears when you share the link or when displayed on Google via the "meta title")
Head Insert (advanced)
This is for adding meta tags and scripts. Adding something may break the site so double check your work.
Accessible under the "Home" resource (page)
Go to the "Template Variables" tab
Then go to the "Meta" tab on the left
Fill out the page then review your work by pressing the green "View" button on the top right