Click on the relevant homework assignment,
press the Download button,
uncompress the zip file
and navigate to the HWXX directory.
Open the file in GitHub (by clicking on it),
press the Raw button,
right-click Save Page As,
navigate to the directory where you saved the file.
Make sure the file is saved with the correct filename extension.
For example, the extension in the filename
HW02.ipynb is .ipynb.
Open the HWXX.ipynb file using Jupyter (and Python 2.x), and follow the instructions in the Notebook. Deadline is indicated at the Dropbox site referenced in the Notebook.