iOS Twitter integration questions

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Project Description:

I have some questions regarding Twitter integration in iOS app.
When user is not logined or does not have defined Twitter account defined, it asks on Settings screen for Login and password. So it asks to authorization, which is ok.
After you enter details (user name and password), it posts tweet correctly. But what if user clicks on Cancel and does not want to authorize app.
When user clicks on Cancel on Settings twitter authorization screen, how do we return to app. So the problem is that it stays in Settings screen if user cancels authorization.

So I have questions:
1. How do we return to app if user does not want to authorize app in Settings screen?
2. Is there some options I need to set on Twitter website in my account?

I am not looking for some to code it, just I need someone who had similar issues and know a way how to make it.

Skills required:
Objective C
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