Run pip install -r requirements.txt
or install each dependency.
Install MongoDb
Install mongoengine
Install flask
Install flask-login
Install flask-browserid
Add the file db_config.py in PythonForum directory with the line
db_uri = 'mongodb://<Server Name>'
Add PythonForum to PYTHONPATH
Run $ mongod --dbpath PythonForum/database/
Run $ python -m PythonForum
Navigate to wherever you named the server, and enjoy.