I just found the solution to the main problem.

http://www.dotnetnuke.com/Resources/Wiki/Page/DNN-600-Radeditor-Toolbar-config-options-and-Config-Features.aspx

DNN 600 Radeditor - Toolbar config options and Config Features
Modified on 2011/07/31 03:04 PM by cathal Categorized as Telerik

But... now there is another problem...

Now I can see image insertion / Image Manager window. But it empty; it is NOT listing the existing image files that are located in the Portal ROOT folder, Images folder, etc.

Then I went back to Host >> HTML Editor manager Settings.
There I see "Image Manager Settings" Path drop down list is "empty" and "small / shrunk".

Where can I set the "Path" globally for a child portal please? (so that the new Editor picks up and shows the available image files)

Hi Jonathan,

Thanks a lot for your prompt response.

I tried that solution (going back to FCK editor); it didn't work
I installed the DotNetNuke-RadEditorProvider again. It didn't work

About 15 min. after re-installing the above provider, when I tested, I was glad to find that it now shows "Portal Root" as the default path in the Image Manager settings.

While this will be of great help, I still can't browse to subfolders and their contents; I can only add images / link to files present in the ROOT folder.

Thanks again,
Vijay