Scroll down and link selector

Hello everyone,
I try to scrape a flickr page for a catalog of greek inscriptions. ( I need to scroll down to make all photos appear, then click on each one to scrape the ID number and the comments. But webscrapper won't let me use a link selector after the scroll down element ( error : selected elements is not child of the given parent). I can't figure out how to use it and I would welcome any help. I just know nothing about programming (which is why I use webscraper).