You need to know whether the outlet you want to change is on a 15 or 20 amp circuit. If you don't know what that means, hire an electrician. Purchase the appropriate GFCI outlet. Read the directions...
come in your line side of the gfci and out the load side and onto the next device,which will make it gfci protected.You can go as far as 3-6 depending on the inspecter having juridiction and the...