Brother MFC-3240C - Manual (Page 134)

8 - 12 USING YOUR MACHINE WITH A MACINTOSH ®
3
From the Output pull-down menu, select Facsimile.
When Facsimile is selected, the top button changes to Send
Fax and the Address button will be available.
4
Click Send Fax.
The Send Fax dialog box appears:
The Send Fax dialog box has two list boxes. The left box shows
all the previously Stored Fax Numbers and the right box shows
the Destination Fax Numbers as you select them.