Follow the steps below.
1. Connect the AC power cord to your Brother machine and then connect it to an AC power outlet (electrical socket). ...
2. Press Menu.
3. Press Up or Down arrow key to choose the Network and press OK.
4. Press Up or Down arrow key to choose the WLAN and press OK.
Brother supplies laser printer, multifunctional printer and a lot more for any assistance dial Brother printer support number | Brother printer customer service number