iPhone SDK Help

Okay, I am new to programming in Cocoa C and on the iPhone but I have a quick question about the sdk. I want to know where I can find out how to provoke and action when clicking on something. For example If I have four images on the screen I want someone to be able to click on one and have it take them somewhere. I know this is a pretty noobish question but I cant find anywhere online that explains it easily. I'm sure its on the SDK page somewhere but it's such a simple and common action I can't seem to find it. Any help would be appriciated. Thanks.

Open the view file (.xib) in interface builder, open the inspector tools palette and assign an action to the image.