Okay, first open your project and click on the project icon, then select the icon below Targets. Select Summary from the right hand side, and change the Devices from iPhone to Universal (under the iOS Application Target). Now your app is ready for iPad. Now to modify the views, if you are not using XIB files, go to your view controllers viewDidLoad / loadView method and write the following code:
if(UI_USER_INTERFACE_IDIOM())
{
// re-size your views here
}
And if you are using XIB files, go to your viewcontrollers XIB file, select the view(i.e view window, label, buttons etc.) and select Show Size Inspector from Utilities.
Now you can see Autosizing panel just under the origins and height-width menu. Select the arrows inside box to set autoResizeMask to get the desired size in iPad and then select the arrows outside the box to set the position in iPad.
And that's it, hope this helps you :) Cheers!