To add a meta keyword, click on the field and validate by urgent "Return". You may take out tags by clicking the cross. By default, PrestaShop's deep URLs (that is definitely, distinct pages rather than on the net the domain title) are uninformative to each shoppers and engines like google: https://bookmarkgenious.com/story19325720/the-tag-hreflang-automatici-e-tag-canonici-seo-diaries