I made a website depending on this book.But the company want the website to show only the last 4 news.What should I change to reach this result?.I hope that I will not need to change alot of code.

In file ConfigSection.cs
 [ConfigurationProperty("rssItems", DefaultValue = "4")]

Sorry I was talking about the archived newsletters which shows newsletters that have been sent already.I want to show the last 4 newsletters only.