Not stupid at all. They UI can certainly improve, suggestions welcome :).
1. Sign in (top right)
2. Click "Get Started" to clone existing sample Library of notebooks - (a library is like a Project or Repo)
3. Click clone - this will give you your own copy of the Library
4. Click Run (this will give you a docker container with a bunch of pkgs. you can add your own pkgs).
To start from scratch
1. Sign in
2. +New Library. Give it a name or load a full Github repo including all its data)
3. Once in the Library, +New Notebook (or load a notebook from your machine)
4. Click the new notebook name or Run to land in your docker instance.
Hope this helps!