How to Install GFCI Receptacle Outlets Label the Outlets. Attach the “GFCI-protected outlet”label to downstream outlets.Test the downstream outlet by plugging in the GFCI tester and pressing the test button. Note:The lights on the tester should go out.Press the reset button on the GFCI to reenergize the outlet. Fasten the new GFCI outlet to the outlet box with Phillips screws (use the same holes).STEP 7:Position the new GFCI outlet cover over the outlet and attach it with flat screws. GFCI Outlet Installation. Areas that have a faucet installed are required to have GFCI outlets.These include kitchens, bathrooms,garages,laundry rooms,and pool areas.GFCI outlets are designed to prevent accidental electrocutions.