I have installed theme flat-responsive and it has font awesome css inside. I also see this in functions.php
wp_enqueue_style( 'flat_responsive_font-awesome', get_template_directory_uri() . '/css/font-awesome.min.css', array( ), current_time( 'mysql' ), 'all' );
But I couldn't use it, example <i class="fa fa-camera-retro fa-lg"></i> fa-lg
showing nothing. I want to do a custom css using this font awe some icon, how can i do?