To include a meta search term, click the sphere and validate by pressing "Return". You are able to take out tags by clicking the cross. Canonical URLs are utilised to avoid duplicate articles and to point to search engines like yahoo and that is the “original” webpage. It is actually https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html