devi inserire i dati nei "meta tag" ( quindi in sezione esperto , prima della chiusura del tag head )

qui un esempio dall'assistenza di twitter:

--
<meta name="twitter:card" content="summary" /> <meta name="twitter:site" content="@nytimesbits" /> <meta name="twitter:creator" content="@nickbilton" /> <meta property="og:url" content="http://bits.blogs.nytimes.com/2011/12/08/a-twitter-for-my-sister/" /> <meta property="og:title" content="A Twitter for My Sister" /> <meta property="og:description" content="In the early days, Twitter grew so quickly that it was almost impossible to add new features because engineers spent their time trying to keep the rocket ship from stalling." /> <meta property="og:image" content="http://graphics8.nytimes.com/images/2011/12/08/technology/bits-newtwitter/bits-newtwitter-tmagArticle.jpg" />

con tag og (anche per facebook) e tag per twitter...

Poi devi registrare il tuo sito su twitter facendolo validare:

qui il link:

https://twitter.com/login?redirect_after_login=https%3A%2F%2Fcards-dev.twitter.com%2Fvalidator

Qui una guida :

https://blog.mrwebmaster.it/2016/03/14/implementare-le-twitter-card-per-il-seo.html