Flightbox not displaying…

Hello – great plugin, but for the life of me I do not know how to enable Flightbox. I have checked every option and cannot find a simple on/off or enable/disable button. How do I enable it? At the moment all my pdf’s download. I would like them read in Flightbox.

Just to add, does it have something to do with the File Away options: Modal Access. It is set at default edit_posts. I changed it to a different setting but made no difference.
According to this article: http://tidyrepo.com/file-away/ once you select Directory or File upload, a whole list of parameters appear. In my case nothing happens – no parameters appear when I select either option… Please help. Thank you

https://wordpress.org/plugins/file-away/