Usenet newsgroups are forums in which you can post messages to discuss various topics: almost any subject you like (and many you don't!) can be found there. Although usenet has become less popular than it once was, because of the increasing use of web forums, etc., it is still a useful tool. KDE provides a powerful usenet news reader called KNode.
You can find KNode in the Menu under the entry: the menu entry launches the program.
The main window of KNode should now be displayed on your desktop as shown; on the first start, the settings dialog will be invoked.
The first page of the settings dialog is for personal settings:
In the field Name, enter your name. This name will later appear in the newsgroups as sender, and can be seen by anyone.
Filling out the field Name is mandatory.
The email address you enter here will be used as sender in news articles, i.e. as actual address of the author, in conjunction with the real name (set in the field Name).
Filling out the Email Address field is mandatory.