Import plugin in existing project

What I must do for using that plugin on my Ionic2 project? (

After the

$ cordova plugin add
$ cordova prepare

I don’t understand how to import and then use its functions in my project.
If someone maybe can help [with a simple example?], would be really appreciated.

It’s a dumb question, i know.

No one can help me with that n00bish problem? :cry: