If your Brother printer is not connecting to WiFi, start by ensuring that the printer is within range of the wireless router. Check that the WiFi network is working and that you have the correct network password. Restart both the printer and the router. Use the printer’s control panel to navigate to the "Network" settings and run the "Setup Wizard" again. Ensure that the latest drivers and firmware are installed on your computer. If the issue persists, refer to the Brother support website for additional troubleshooting steps.