Twitter card implementation


I have the email from Twitter stating that my Summary card has been activated which is excellent news, I have a SEO plugin on my Wordpress site by Yoast that allows a one click enabling of Twitter cards, which makes life easy for us numbnuts who know zilch about such things (just wanna write about food) but I have zero idea how I now use the twitter card or make it real. What I do know is that as far as I can see no summary cards appear on my tweets?

The iste is

Any pointers appreciated from you know it alls