Insalling and using plugin

I installed this plugin to have it be a pop-up when a visitor lands on the blog and reads it. I would like to have the subscribe pop-up activated. I have installed the plugin and created a scrollbox (I think I am doing this right…) and I am at the point where it’s set but my options on the page are “publish”. I am wondering if I publish it will it show up as a post on my site and will my current subscribers get a notice as they normally do with posts?
I am a bit unclear on how to finish up the process from here on out. Please help.

https://www.ads-software.com/plugins/dreamgrow-scroll-triggered-box/