Brother MFC-8870DW - Manual (Page 71)

Wireless configuration for Macintosh ®
57
5
18
Using the information you recorded in step 10, return
the wireless settings of your computer back to their
original settings. Click Next.
19
You have completed the wireless setup. Click Finish.
If you would like to continue installing drivers and
software necessary for operating your device, select
Start Here OS X from CD-ROM menu.