How to use LinkedIn API in iPhone SDK?

I want to use the LinkedIn API in my project, but I haven’t found any good tutorials about using LinkedIn API. How to use LinkedIn API?

“A beginners guide/introduction” of “basic concepts” would be helpful.

OK, after googleing around I went to this link LinkedInAPI.

I filled in the form but I am unable to understand what the “Integration URL” (Example URL where the integration will go live.)

Because I want to use LinkedIn in native iPhone application not on any website?

So after getting keys how do I use those keys and how do I authenticate user and get some profile info,post status like all the things?

I know for authentication there is an Objective-C wrapper MPOAuthMobile. I have also downloaded that but unable to understand. What this cumbersome API uses?

How to use LinkedIn API in iPhone SDK?