Add native features to iOS App

Hi everyone, I have an iphone application which needs some features added. The application itself is a book like aplication that basically reads some HTML files for display to the user. The current app does this: 1. Loads splash screen 2. Shows terms and conditions (only if they have never agreed to them) 3. Displays table of contents 4. User clicks on any of the table of contents item 5. Application reads html file pertaining to the selected section and displays on screen to user. However, there isn't much user interaction other than this. As far as what features can be implemented, I leave that to the worker's discretion. As of now, since I am not very familiar with this, I would like a worker to implement native iOS features that will provide more user interaction with the user. Attached I send you details of features I require for the application as well as screenshots. I will provide full source code to selected worker.