Exclude pages ok, but whatabout include

Hello,

I just installed the plugin to display a content alert on a specific page of the website (the page displays artistic nudes photographies)
I found the field to exclude pages from the display, but I don’t want to add all the pages (and futur pages) of the website. I just need to display it on 1 page.
Do I understand something wrong or this feature do not exit in the plugin ?

Thanks in advance.