When I choose to connect to an existing notebook nothing happens. When I choose to clone I get to the login screen by clicking the login button does nothing :|
EDIT: I'm now able to login. It brought up a little redirect modal after entering my user name which due to my typing was apparently getting canceled. The notebook load, but I get now chart.Plot output.
I haven't used jupyter notebooks much. They seem cool, but not as cool as light tabels insta-repl.
http://imgur.com/a/JgcqP
What happens when you click the Intro to F# sample on the front page? It should render the notebook and if you clone, it should prompt to sign in as above. Hope this helps.