Placing code for a featured post slider

I’m trying to place a featured post slider in my site between the navigation menu and the first post. I have this code for the plugin:

<?php include (ABSPATH . ‘/wp-content/plugins/wp-featured-content-slider/content-slider.php’);?>

But I’m not sure which template in the WordPress editor to drop it into and where exactly to place the code so that the slider is displayed where I want it. Obviously I’m in a little over my head.

Any suggestions would be much appreciated.