If you’re using the “Junction” font, open up the font-replacement.php file in the theme folder and go to the very bottom. There you’ll find the code for the text shadows 🙂
If you’re using firefox you can install the “firebug” plugin to see what specific css you need to edit to change certain elements. If you’re using chrome then you can right click on the element and select “inspect element”. That should guide you to the correct css 🙂
Hope this helps!