You may select one of the Input Sources.  By holding the cursor over an item a pop up help screen describes that input source:

Labels - This input source will print to labels placed in your printer.  We have included several popular labels.  The default label for all formats is the Bates 4x20 (Avery 5267) return address label.  You may add any size label to the default labels using the add label feature.  If adding a standard label, you will find specs for most of them in the label section of word processing programs like MS Word.

Paper Documents - This input source will print the Bates Stamp to existing paper documents placed in your printer paper tray as a Windows print job.  Just as if you pasted a label on it.  This makes any Windows printer a Bates Stamp Machine.

Use Existing Data – This input source allows the use of input data from a previous Bates  production.  This makes adding additional documents to a case very easy to do.  The “Use Existing Data” selection will be "Grayed Out" if the user has no associated Client Information.