Brother MFC-5890CN - Manual (Page 74)

Wireless Configuration for Macintosh ® using the Brother installer application (Not available for MFC-5490CN and MFC-5890CN)
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Disconnect the network cable between your access point (hub or router) and the machine, and click
Next.
p Check the box after you confirm that you have completed the wireless settings, and then click Finish.
You have completed the wireless network setup. If you would like to continue installing drivers
and software necessary for operating your device, please choose Start Here OSX from the
CD-ROM menu.