ref: https://support.brother.com/g/s/id/htmldoc/mfc/cv_mfcl2750dw/use/manual/index.html#GUID-6724461D-8AB1-4461-B32B-CA39AE21FD9A_215
 

1. Press Menu.
2. Press  or  to select the [Network] option, and then press OK.
3. Press  or  to select the [WLAN] option, and then press OK.
4. Press  or  to select the [Setup Wizard] option, and then press OK.
5. When [WLAN Enable?] appears, enable the wireless network.
   This will start the wireless setup wizard.
6. The machine will search for your network and display a list of available SSIDs. When a list of SSIDs appears, press  or  to select the SSID you want.
7. Press OK.
8. Do one of the following:

   • If you are using an authentication and encryption method that requires a Network Key, enter the Network Key you wrote down in the first step.

     Enter the WEP key, and then press OK to apply your settings.

     To apply the settings, select [Yes]. To cancel, select [No].

   • If your authentication method is Open System and your encryption mode is None, go to the next step.
   • If your WLAN access point/router supports WPS, [WPS is available] appears. To connect your machine using the automatic wireless mode, press . (If you choose [No], enter the Network Key you wrote down in the first step.) When [Press WPS on rtr] appears, press the WPS button on your WLAN access point/router, and then press  twice.
9. The machine attempts to connect to the wireless device you have selected.