The User Defined URLs edit panel is used to display and edit UDURLs for the current file selection. The description field is intended to describe the content the URL references. There can be more than one of these items in a file but each description field should be non-empty and unique.
In FLAC and OGG files, Yate uses this field type, along with UDTIs, to store unmapped items.
The table displays the UDURLs found in the currently selected files.
All editing and manipulation is done via the context menu and is described here.