Get Your Data from GitLabTM for Computing
To work on your project via the uni marburg JupyterHub you simply have to do a git clone *ssh-to-your-gitlab-repo* and follow the Git and GitLabTM workflow from the tutorial, just as you would on your local machine. For this, you need to have gone through the Setup and Installations for working on the JupyterHub.
Check out these tutorials for introductions to Jupyter and JupyterLab: