If your two-lever faucet is dripping, you can stop the drip by replacing a rubber washer or some gaskets, depending on the type of valves the faucet has. If you can't turn the levers more than 90 degrees, the valve has disk valves. If you can turn them through 360 degrees, it has compression valves. Either way, you shouldn't have any trouble making the repair, but with a disk valve, there's a slight chance that one of the valves is damaged. If so, you'll have to replace it.
Turn off the shutoff valves under the sink and open both faucet handles to relieve water pressure.
Remove the handles. You should be able to see a screw on the top of each one that you can unscrew with a Phillips screwdriver. If you don't see screws, they may be hidden under decorative caps. Pry the caps off with a flat-head screwdriver and remove the screws.
Unscrew the packing nut from each handle with adjustable pliers. It's a good idea to wrap a rag around the nut before using the pliers to protect the finish of the handle. If the faucet has compression valves, you should be able to pull them out with the pliers. If it has disk cartridges, you'll probably have to unscrew some screws with a Phillips screwdriver to remove them.
Turn the compression valve stem over and unscrew the seat washer on the end. Replace it with a new one. Push the valve stem back into the housing and screw the packing nut back on. Replace the handle.
Pry out the rubber gaskets from the inlet holes inside the valve housing if your faucet has a disk valve. You can usually do this with a flat-head screwdriver. Take them to a hardware store to buy replacements. You'll need the model number of the faucet to find the correct ones.
Guide the replacement gaskets into the holes with the flat-head screwdriver and screw the disk cartridge back on. If the cartridge appears cracked or chipped, replace it with a new one; you can't repair these types of valves. Screw on the packing nut or collar and replace the handle.
Turn on the water and test the faucet.
If the placement of the screws isn't obvious, look under the lever. You may find a small hex screw. If so, unscrew it with an Allen wrench.
Be sure to turn the water off before you loosen the packing nut. If you forget, you could be scalded by an uncontrollable stream of hot water.
Deziel, Chris. "How to Fix a Dripping Two Lever Kitchen Faucet." Home Guides | SF Gate, http://homeguides.sfgate.com/fix-dripping-two-lever-kitchen-faucet-70339.html. 09 December 2018.