This is an integration of the Yo service for WordPress. It will track Yo subscribers and allow you to send a Yo when you make a new Post. After it’s installed, go to the ‘Yo’ tab under Plugins. There you can enter your API Key to send Yos, and see a list of Yo subscribers, how many times they’ve sent you a Yo, and the last time they sent you a Yo.
Now when you write some posts you’ll send a Yo to all your subscribers. As you gain subscribers, they’ll get listed in the table on the Yo WordPress admin page.