To incorporate a meta keyword, click the sector and validate by pressing "Return". You could clear away tags by clicking the cross. Canonical URLs are used in order to avoid replicate content and to indicate to search engines like google and yahoo that is the “unique” web page. It is https://addons.prestashop.com/pt/seo-referenciamento-natural/31857-rich-snippets-automaticos-json-ld-opengraph-seo.html