Popup on selected pages?

I have the full version of your plugin. It says (on the plugin website), that I can customise where I want the popup to appear. I want it to appear only once, on the site’s main page, and preferably only once per visit, but I can live with just on the main page.

However, the plugin settings either turn it on for all pages (which is incredibly annoying for visitors) or turn it off. How do I make it appear only once?

https://wordpress.org/plugins/readykommerce-multi-newsletter-signup-light/