Look at your page source and see if your html markup actually contains the entry-title class, i.e.:
<h1 class="entry-title">My Page Title</h1>
as it must for the span and other classes for date and author.
If it does, clear your cache and try Google’s testing tool again. If your page source does not contain the correct markup, be sure you have edited the correct page template. Themes can contain several different templates for pages.
Dev Tools are great for this sort of thing; use Firebug with Firefox, or use the developer tools in Chrome or Safari or IE to see what’s loading on your site and how to work with and change the CSS and HTML.