The Total Rename screen. The general Editing panel is on the right. Here you can easily edit a single file or the whole list with find-and-replace style renaming:

Total Rename screen

The Tasks panel, expanded to list all the available pre-defined renaming tasks:

Total Rename screen

The Grouping and numbering tab. Rename files in numbered groups, or just add numbers and prefixes/suffixes to the existing filenames:

Total Rename screen