Brother MFC-8640D - Manual (Page 89)

4 - 17 USING CONTROLCENTER2.0
Before finishing the Copy button configuration, you must set the
Printer Name. Then click the Print options button to display the
printer driver settings.
In the printer driver settings window you can choose advanced
settings for printing.
The Print options screen will vary depending upon which
model printer you have selected.
You must configure each of the copy buttons before they can be
used.