Your site uses a plugin called WP Bakery that allows you to easily make content and layout changes. We have included some basics below but we recommend checking out their regularly maintained and updated documentation here.
To use WP Bakery to edit a page:
From the WordPress Administrator Interface, click Pages on the left navigation menu. You’ll see a list of every page on your site, organized by folder structure.
Click the page title to begin editing it. When the screen refreshes, you will be viewing the page in Backend Editor, which looks like the screenshot here, Frontend Editor, which allows you to edit the page as it appears on live, or Classic Mode which will allow you to select Text and view the HTML.