I signed up at codebox.io and when I go to "Start editing" a test box that I created, I get a HTTPAuth login box. Not sure what to enter here, but my codebox.io

I signed up at codebox.io and when I go to "Start editing" a test box that I created, I get a HTTPAuth login box. Not sure what to enter here, but my codebox.io password doesn't work. I thought that maybe I had missed a dialog box with a user/pass, so I went to delete my test box and create a new one. But nothing happens when I click the delete button for my one box.