Hi nangluv, thanks for your interest in my plugin.
First of all, you have to setup the player.
After that, you’ll be ready to add videos to your posts.
https://ilghera.com/playlist-shortcode-jw-player-7-wordpress-premium-1-2-0/
Here more informations.
https://ilghera.com/category/plugin/
Hope this helps, thanks again ๐