How do I set up a wireless connection on my Brother printer?
Press the WiFi button and launch the wireless installer on your computer, then follow the on-screen instructions to set up a wireless connection between your machine and your network. When the WiFi light is on, your Brother machine is connected to a wireless access point; when it blinks, the connection is down or connecting. (Page 6)
From the official Brother HL-L3290CDW Color Laser Printer manual, page 6
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