When installing a GFCI outlet with 4 wires, first, turn off the power and confirm it's off. Then, connect the green or bare ground wire to the green screw on the GFCI outlet. Next, connect the white neutral wire to the silver screw marked "LINE," followed by the black hot wire to the brass screw marked "LINE." Lastly, if any additional wires are present, make sure to connect them to the respective LOAD terminals on the outlet.
Urgent: Always consult a qualified electrician for installation of electrical devices to ensure safety and proper function.