The step by step instructions in Section 1.4 do not seem to apply the current version of ArcGIS Online. In the Book, Step 2 shows a button called "Make A Web Application"; this button is now changed, as are all the subsequent steps. I was able to publish the practice map, but I can't do Step 5, Lick the View button to go to the app's details pages and all the subsequent editing.
This is kind of discouraging since I'm only on Chapter 1. If it's not just me, everyone who has bought this book lately or will buy it in future will have the same problem. Is there an errata sheet?