I was trying to add Twitter cards to my site. I have added the required markup and visited the card validator tool. The screenshots in the developer documentation and all other websites show that their will be a button to apply for the twitter cards. I see no such button just a URL field and the preview on the right. After a few tests it showed that my domain is whitelisted. However, I am not sure how i can get analytics for my cards if I don't apply or add my domain somehow.