pycharm not picking up on code completion of Django (bitnami install)

Hello,

using the community edition of PyCharm on a mac.

I've installed Django using a Bitnami install package.

Created a project using the manage.py command, then opened the resulting directory in PyCharm, but the IDE doesn't seem to pickup on the Django classes.

Any pointers to how i can configure the IDE to pickup on the Django classes ? Do i need to add the Django library(labraries?) to the Externam Libraries section in the project ? 

thanks,
tom