How to add a comment of registered user?

I am using the JSON Api to get some articles from my site to my app. Everything works fine until I get to the point where I want to submit a comment form register user. I have activated the Respond Controller in the WordPress Settings. this is the test string I use according to the documentation: http://ift.tt/1kIsM6B comment

it shows the entry in database as a anonymous user.

But I don't understand how to add a comment from registered user via JSON. Please can anyone help me out here and show me an example of how to do it???

http://ift.tt/TrbNrU

via Chebli Mohamed