After you have structured facts code with you, just increase it to HTML code from the page. For CMSes it will depend on the file the place the HTML of your theme is coming from. It could either be header.php or some other file while in the theme folder. Below https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html