Brother MFC-640CW - Manual (Page 117)

Printing and Faxing
111
d
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 choose them.
e Enter a fax number in the Input Fax Number box.
f
When you are finished addressing your fax, click Send Fax.
Note
If you click Send Fax without addressing your fax, the following error message appears:
Click OK to go to the Send Fax dialog box.