How to get email address for making iPad Facetime call

I want to make a Facetime call to my friend's new iPad 2. How can I get email address for iPhone to iPad Facetime call.Make sure that FaceTime is enabled within the settings on each device. Once turned-on you are able to assign an email address to the device and this will allow for FaceTime chatting. Go to her name in the "Contacts" list. Choose Edit and enter her email address in the pop up page