Hi. Ok, with the rear terminal block cover open, you will see three wires. Black on one end, white in the middle and red on the other end. Use your 3/8′ nut-driver to remove the nuts or a phillips screwdriver to remove the bolts (depending on your dryer) and remove each dryer cord wire from the terminal block. When you remove the nuts or bolts, be careful not to drop them down into your dryer. Next, you need to disconnect the bonding jumper on your dryer. The bonding jumper is either a metallic strap (typically copper or copperclad) or a green wire that is connected between your dryer’s neutral (white wire) terminal and the green ground screw connected to your dryer’s frame. If you removed a ground wire instead of a bonding strap from the neutral terminal, you need to connect this ground wire to your dryer’s frame. Loosen the screws at the connector and pull the cord out. Now thread your new cord through the connector and tighten down. This only needs to be snug do not over tighten. Sometimes the old connector will work with the new cord and sometimes not. If not, your new cord will include a connector that you may use. Now,to hook up your new 4-wire dryer cord, connect each wire to the dryer’s terminal block matching color for color (white to white, black to black and red to red). Connect the green wire to the green ground screw on your dryer’s frame. Once the wires are connected, simply recover the space, and secure the cover with the screw provided.