autoload for first page only

Hi, My client (Woodstock Farm Animal Sanctuary) has purchased Easy Modal Pro, and now I am trying to set up a modal to autoload when a visitor *first* loads a page (any page) on the site and then to not have the modal autoload again when that same visitor goes on to a different page on the site. We want the announcement to display for a given visitor just once, only on the first page load – and it could be any page of the site where they come in. I’m pretty sure I see how to set it up to autoload sitewide, but I don’t see how to configure EM to prevent the modal from autoloading on each ensuing page load…

Can you please point me in the right direction?

Thanks!
Susan

https://www.ads-software.com/plugins/easy-modal/