Help with inserting php plugin code into my php file

Plugin: Anything Popup.
Can someone help, please? This plugin works well- I copied the shortcode and pasted it in one of my pages, and it showed up and worked fine.
Now, I want to paste it into a php file, but I dont know which php code to paste into my php file. The plugin instructions says to copy and paste the php code of the plugin into the php file in order to have it show in the php file.
I went to edit of this plugin, and there is so much php coding there, how do I know which part I am supposed to copy and paste into my php file??
Please help!
Thanks!