Help with PHP code placement

Hi there!  I recently bought a 1-domain premium license and installed the plugin but I can't get it to appear on the page. I put in the shortcode where I want it to display on the page, but I can't find where I'm supposed to insert the PHP code beneath the shortlink.  I tried putting it in the code view of the page I want the grid to display on, tried putting it into the functions.php file, but the grid still isn't showing up.  Where should it be placed? Thank you!