To make changes to Page settings, you must select the configuration gear (the large grey gear) and click the Edit link. NOTE: Site Owners & Administrators can see all fields below. Content Editors can see just some of the options. Basic Members do not have access to the configuration gear. Read more about Page Settings
The Reader app gives you the ability to have dynamic RSS (Rich Site Summary) feeds on your site.
What is a Feed?
A feed is a web technology that pulls in rapidly or frequently updating information from a web source. The information is often displayed as dynamically changing list. A common type of content used in web feeds are news headlines. New headlines are constantly being created, so this content really lends itself to being displayed as a feed. Read more about Reader (RSS Feed) App
The News app will enable you to post and manage news that you would like to publish on your site. Examples of News items might be recent developments in projects that you're affiliated with, awards, course-related updates, a new book or article releases, press mentions, etc. The News app, like other apps, can be set as private or public giving you control over how and to whom content is displayed. Read more about News App