To the Brother HL-2270DW wireless setup, first plug the power cord into a wall outlet and then plug it into the back of the printer. Next, connect one end of the Ethernet cable to your router or modem and then connect the other end to one of the ports on your printer. Turn on the power switch on your router or modem, wait for it to finish booting up, and then turn on the power switch for your Brother HL-2270DW wireless setup.