I have a single handle pull out spray Kohler faucet. Can anyone tell me how to remove it.
Thank you in advance.

Which one do you have? There are so many different ones.
KOHLER: Product List: Kitchen Sink Faucets: Faucets: Kitchen

Shut the water off in the cabinet. Now unscrew the supplies from the valve and using a basin wrench, (see image) remove the retaining nuts securing the valve and pull the valve free. That's all there is to it. Good luck, Tom

Tom, some of kohler's faucets require a slender tool like a long socket, a basin wrench does not work well on those.

Thanks Doug