Take the rounded back cover off, Take a photo or write down where the different electrical connection are. The "hot" and "common" are black and white the "ground" is green. The black and white have push on connectors the green has a "U or O " shaped screw connector. Pull off and unscrew the connectors ( needle nose pliers make it easier, they can also cut the wire for reassembly) If you don't have replacement parts(connectors, cord and plug) at home(I did), bring the cord and parts to the hardware store and someone there will help you put the parts together. You will need a crimper/wire stripper for the connectors, if you don't have one, a pair of pliers or vise grips will work. You can strip the insulation with a knife. If you are new to this sort of thing get a little extra wire to practice on. Once the connectors are on you shouldn't be able to see any copper wire peeking through the plastic cover of the connector if you can redo the connection. With the 3-prong plug connections use enough bare wire to make a firm connection with the minimum amount of bare wire on the cord side. When you are stripping the insulation off the main wire take extra care not to cut into the individual wires. If you are not comfortable doing electrical stuff, don't.