You can get to the Docs via either the link at the top of the site here, or within BSS when you first load it and I think maybe from the Help menu too. Unfortunately it won’t cover that as BSS doesn’t provide a way to use them. Try a search here on the forums for PDF and I’m sure you’ll find lots of posts about it and I know I did post something on how to go about it a few times on the forums.
Hmm I hadn’t thought about the location of the files being uploaded. @richards idea would definitely be best if you are hosting on the BSS hosting, but if you have your own account with access to upload files then you can just link to them directly rather than needing to use an iframe.