First make sure you have met all prerequisites.
Put tellafriend somewhere on your pythonpath. The easiest way to achieve this is to use pip: pip install django-tellafriend.
Add the following to your project’s INSTALLED_APPS setting if not already present:
INSTALLED_APPS = (
# …
'django.contrib.sites',
'captcha',
'tellafriend',
# …
)
Add this to your main urls.py:
urlpatterns = patterns('',
# …
(r'^tellafriend/', include('tellafriend.urls')),
# …
)