If your notebook is in Github private repository, Github personal access token is needed. Create a token at https://github.com/settings/tokens by clicking Generate new token button.
This token needs repo level access, thus check on repo as shown on following image.
Once installed, you can open macro browser and search for Jupyter or IPython.
Go to notebook in Github and copy full url eg. https://github.com/jakevdp/sklearn_tutorial/blob/master/notebooks/02.1-Machine-Learning-Intro.ipynb
Enter the URL in Notebook URL field in macro UI. Once saved and published, notebook will be rendered as shown below: