Well it seems you want to load a detailview when user selects a cell and you want the user to be able go back to the previously view when back or some button like that is pressed. You need to use navigation controller for that. Here is the link to apple's doc http://developer.apple.com/library/ios/ipad/#documentation/UIKit/Reference/UINavigationController_Class/Reference/Reference.html
And here is a sample tutorial to get you started
http://razell.hubpages.com/hub/IPhone-Guide-Loading-a-detail-view
Hope this helps, let me know if you need any more help.
EDIT:
So according to your comment you are looking for a modal view to pop up over the view. Well here is a link to whole a lot of different ways to achieve that, and they all have example projects too so you can actually see how the trick is executed.