You don’t add a WordPress “block” to your theme the way you would a plugin or a widget. A block lives inside the editor, not the theme files. What you’re really doing is making it available in the editor and then placing it where you want.You don’t add a WordPress “block” to your theme the way you would a plugin or a widget. A block lives inside the editor, not the theme files. What you’re really doing is making it available in the editor and then placing it where you want.You don’t add a WordPress “block” to your theme the way you would a plugin or a widget. A block lives inside the editor, not the theme files. What you’re really doing is making it available in the editor and then placing it where you want.