Brother MFC-8640D - Manual (Page 149)

7 - 34 USING YOUR MACHINE WITH A MACINTOSH ®
To change the destination application, select the appropriate
application from the Target Application pull down list. You can add
an application to the lists by clicking the Add button.
Enter the Application Name (up to 30 characters) and select your
preferred application by clicking the Browse button. Also choose the
File Type from the pull-down list.
You can delete applications that you have added. Just select the
Application Name and click the Delete button.
This function is also available for Scan to E-mail and Scan to
OCR. The window may vary depending upon the function.