With that open as part of your browser, go back to the marketplace inside the backend and click on the icon in upper suitable corner to open this menu: Through this tutorial we saw the way to install OpenCart inside a Windows ecosystem, but this applies wholly to other servers https://www.presta-addons-modules.com/en/opencart-seo-automatic-google-rich-snippets-json-ld-integration-opengraph-twitter-tags-schemaorg.html