This window displays all the available newsgroups for your newsserver. It may take quite a while to read in all the entries into the window.
To find a group, enter in some text into the string gadget, and press enter, and the next group with that text in the name will be displayed. Download Group List downloads the group list from the newsserver again.
To subscribe to a group, either doubleclick on an entry, or select it and press 'Subscribe'. The New Newsgroup window will then open for you to set the settings for that group.