To open and run:

make sure u have django and python downloaded. to get django and create a virtual enviornment
on mac: 

mkdir django
cd django
python3 -m venv django
source django/bin/activate

to install:

pip install Django

(https://djangocentral.com/how-to-install-django/)

clone the repository
and open it. to run it make sure you are in the outer directory that contains
the manage.py file

then,

python manage.py runserver

this should start the server and it should open in the web browser.

then you can create super user:

python manage.py createsuperuser

and make ur own user (command line)

Username (leave blank to use 'user'): admin
Email address: admin@gamil.com
Password:
Password (again):

then open up 
http://127.0.0.1:8000/admin/

and log in with user details to control posts and edit from admin site