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Run the faucet lines through the bottom of the sink into the faucet. On the underside of the sink, hold each line in place with a washer and nut. You may need someone to hold the faucet still as you tighten these to where the line enters the sink. Make sure the sink is level and straight before tightening the lines. Flip over the drain strainer and place it on your counter. Roll the putty between your fingers to make it malleable, then spread it around the strainer's rim. Press the strainer into the drain. Slip the rubber gasket over the bottom of the drain under the sink. Place the threaded flange over it. Secure the flange and drain in place by tightening some washers and a nut in the holes on the flange. Towel away any putty left in the sink. These parts come packaged with the drain, although you can always purchase them separately. Locate the water supply lines coming out from the wall. Slip a metal connector over each one and plug a faucet line into the connector's other end. Tighten the fastener with an adjustable wrench to hold the lines together. The top part of the garbage disposal unit most likely fits over the bottom of the drain and is held by a fastener you screw on. Next, attach the dishwasher hose to a small spout on the garbage disposal unit or the pipes and hold it in place with a hose clamp. Read your owner's manual or search the manufacturer's website for more information on how to install the garbage disposal. The drain pipe should run from the drain to the floor. Place a p-trap under it to connect it to the pipe in the wall. If you have a garbage disposal unit, don't forget to install the pipe running from the drain pipe to the side of the unit. Fasten each pipe together by twisting on a ring-shaped nut with pliers. Turn on the water supply, then turn on the sink. Look for any leaks and repair them by tightening the seals on the pipes or installing new ones. Then, enjoy your new sink! Don't forget to turn on the garbage disposal's electrical supply. Plug it into the outlet and give it a test run.
Set the faucet in the hole on the top of the sink. Seal the drain strainer in place with plumber's putty. Fasten the drain in place and remove excess putty. Reattach the water supply lines to the faucet lines. Reinstall the dishwasher pipe or garbage disposal unit if you have one. Connect all the pipes together. Test the sink for leaks.