Turn off Power to the receptacle you are going to be working on. Avoid shocks and burns and make sure that no power is going to the unit. The easiest way to do this is to plug a radio or lamp into the unit and then turn it on. Next go to the Service panel or breaker box. Find the fuse or breaker that protects that receptacle, and place the breaker in the OFF position or remove the fuse COMPLETELY.
This should turn the lamp or radio off. Unplug the lamp and plug it into the other receptacle to make sure the power is off to both outlets. When you see the lamp or radio not turn on then you know power is off completely. Un-plug your device and move to the next step. If the device comes back on, stop everything and call an electrician.
Using your screw driver, Disconnect the Line wires (these are the wires NOT under the colored tape that should be in place.) from the GFCI you currently have wired, Making sure to not let the wires touch. Remove the GFCI and set aside.
Take the new GFCI Receptacle and attach the wires. The White wire goes onto the Silver screw topped terminal marked WHITE. The Black wire goes to the Brass screw topped terminal marked HOT. Wrap the wires around the terminal and Tighten down the wires with your screwdriver.
If there is a Grounding wire (it will be attached to top of old receptacle, look for a Bare Copper wire or Green) attach it to Green screw at the top of the receptacle. Do this only if there is a Grounding Wire.
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