Brother MFC 8480DN - Manual (Page 82)

Wireless configuration for Macintosh using the Brother installer application (For MFC-8690DW and MFC-8890DW)
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5
f
Choose Step by Step install (Recommended) and then click Next.
g
Choose With cable (Recommended) and then click Next.
h
Connect the Brother wireless device to your access point using a network cable and click Next.