After adding your own feeds, you may want to group them in some way, rather than just leave them unsorted. So let us create a folder for the Slashdot feed we just added:
Select the parent folder of the new folder. In this example, we select All Feeds.
Open → . Enter
News(or a more appropriate name for the feed category) in the line edit and choose .
Now you can drag the Slashdot feed to the new folder.