You import the file list into A Better Finder Rename by opening it with the Browse...
button in the settings section
of the Rename from file list
action.
If you use a simple file list, A Better Finder Rename will assign each selected file its new name based on the order of the selected files. It is therefore a good idea to create your file list in the same order as the files you want to rename appear in the Preview list.
Tab-delimited file lists assign the names in the second column of the file list to the files identified by POSIX file path in the first column. The sorting order is thus not important.
You can reload the data in the currently selected file list by clicking the Reload
button.