Brother MFC 7840W - Manual (Page 73)

Wireless configuration for Macintosh ® using the Brother installer application
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5
f Double-click the Wireless Device Setup Wizard.
g Choose Automatic install (Advanced) and click Next.
h
Confirm the on-screen message and click Next.
i Press Menu, 5, 2, 3 for SES/WPS/AOSS.
This feature will automatically detect which mode (SecureEasySetup™, Wi-Fi Protected Setup™ or
AOSS™) your access point uses to configure your machine.