This is a page from the Flash Renamer user manual.

Filename Editor

The filename editor contains a simple text editor that allows you to manually type in your new filenames. The first line in the text editor corresponds to the first file in your list, and so on. Besides text you can also enter <tags> here.

Problem:
    You have a document, or found a web page the contains the names you want your files to have.
Solution:
    Copy the new names to the clipboard and then paste it in to the filename editor!

Note: The content of the text editor is saved in the file edit.txt located in the Flash Renamer settings folder.