Now i need to convert this app for iPad.
I have verified so many links but all are regardig Xcode 3 ond it's extensions.
Your best bet would be to create two new projects, one for iPhone, and the other universal and see what differences are in place there, especially the app delegates.
Quite a lot of the things won't be needed, however the app initialisation need some consideration, and most views tend to happily scale up to ipad resolutions without much or any additional work.
That was how I added iPad support into one of my apps I was writing anyway.