Skygear server build from binary file



I’m working to deploy skygear server from binary file v 1.6.2 :

I download it and run and it’s work fine.

how to add chat plugins to it.

I follow the installation guide from

but I stop on step 2 :

from skygear.settings import settings

from .chat import includeme


where can I add this code ???
can please explain it??