Things You Will Need
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Remove all of the items from under the sink so you can have room to move. Tighten the mounting nuts. Use a pair of slip-joint pliers or a basin wrench. Don't overtighten the nuts. Turn the water on and see if there's still a leak from beneath the base plate.
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Loosen the mounting nuts enough to raise the base plate about ½ inch above the sink, if the water is still leaking. Clean any gunk around the base plate. Stuff plumber's putty under the base plate and re-tighten the mounting nuts.
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Check for leaks. If there's still a problem, you must remove the faucet. Turn off the water and drain the water lines.
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Unscrew the mounting nuts again. This time disconnect the water lines. Take the faucet off the sink. Remove all the putty. Make sure you don't scratch the sink.
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Buy or make a new rubber gasket for underneath the base plate. If you have to make one, find a piece of rubber that is the same thickness as the old gasket. Use the old gasket as a pattern.
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Re-apply the putty. Put the faucet back on the sink and reconnect the water lines. Turn on the water supply again.