Asset Manager Add-On page can be opened from 'Hyperlink', 'Image', 'Flash' & 'Media' dialogs
(click the folder icon on the dialogs)
This example assumes that the location of the Asset Manager Add-On page is at: http://localhost/Editor/assetmanager/assetmanager.php
And the web assets (images, videos, docs, etc) location is at: http://localhost/Editor/assets/
(This can be flexibly changed. See documentation for more details)