I ensured that the files I am inserting are designated as "public" in Flickr, and also made sure they were under 2 megabytes each in case that was a limitation. When i click "Insert into post" button, nothing happens.
Also, I cannot pull up different photosets, only the most recent one that was created which is brought up by default. I can click "insert set" and bring up the screen where you designate size and alignment for all photos, but still nothing happens when I click "insert into post" on that menu.