Does not show up in WordPress Admin area after installation

How do I use this plugin? After installing and activating it, I see the settings for it in WP, but it’s not in the Main Menu in the WP Admin Area, as the documentation indicates. So I’m not sure if it’s even installed correctly. If I need to add the following line to my theme templates, which ones and where?

<?php if ( function_exists( “TCHPCSCarousel” ) ) { TCHPCSCarousel(); } ?>

I have a child theme, so if I use the child, should I add it to single.php, so that I can use the slider in my posts? Or am I way off track?

https://wordpress.org/plugins/carousel-horizontal-posts-content-slider/