Hello,
To Changing articles in featured section on frontpage
Steps :-
1.First goto admin login
2.Click on Menus, Main Menu *
3.Click on “Home” (or your default menu item) to edit it.
4.Under “Menu Type” you will see “Front Page Blog Layout”. So you want to change this.
5.Click on “Change Type” button.
6.Click to select from here what you want to change the layout to. If you select a Category/Section, you will be required to enter in the Joomla Category or Section name.
7.Save the Menu Item and refresh your Home page.
You can also refer to these url:-
http://docs.joomla.org/Help16:Content_Featured_Articles
http://community.joomla.org/featured-articles/did-you-know/474-tired-of-changing-article-order-on-frontpage.html
http://www.enzolina.com/web/change-joomla-frontpage-display/comment-page-1/
http://www.cmsmind.com/joomla-1-6-make-featured-article-frontpage-website/