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Pull the handle off and the cartrige out of the faucet body then turn the hot water back if t doesn't have good flow with the cartridge out then there's something stuck in the faucet body. If it has good flow but not with the cartridge back in place then you need a new cartridge. To remove the handle you have to turn the bell shaped section just below the handle
Counter clockwise off, with a deep socket if you can't reach it with an open end. If the cartridge is the culprit Kohler should given you a new one no charge. It has a lifetime warranty. Call 800-4KOHLER