I don't know how to save it with Core data.

I don't know how to save it with Core Data.
The project is an OSX app, which I could use XCode's auto-generated template and use Core Data and bindings to add, delete, and display data in Table View, but I don't know how to save it.
I got some information about using managedObjectContext save method, but I can't find managedObjectContext.Application development is already too difficult.

The environment is OSX 10.10.3 XCode 6.3.1.
Thank you for your cooperation.