I am having trouble both adding and removing URLs from this widget's address bar. I can't locate any documentation for it. Part of the problem, I think, is the widget's name is so 'generic' that my searches are either getting no hits, or 900 extraneous hits. So, I am unable to find what I need. Can someone on the forum please help?

The widget opens with a default URL, https://www.kde.org/. When I want to begin using it, for my own purposes, I'd like to remove this. But, how to do this isn't apparent to me. It keeps coming back ...

? What's the first step? Also, what's the functionality of the two icons on the bottom? One in intended to remove 'bookmarks' (but I see no list of bookmarks), unless that means the URL history list, in the drop-down Menu. It doesn't work for eliminating the KDE URL. I selected it, clicked it, and then, nothing changes ... the other icon (blue book with vertical red 'marker' on front cover) appears to do nothing, though it does 'depress' when clicked.