After you have structured facts code with you, simply just increase it to HTML code of your web page. For CMSes it is dependent upon the file exactly where the HTML of your theme is coming from. It could both be header.php or almost every other file while in the https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html