How to replace valve cartridge on Kohler DevonshireWidespread bathroom sink faucet

The cold faucet is leaking, and I am trying to repair it by replacing the valve cartridge. However, for the love of god, I can't find a way to open the faucet so that I can replace the valve cartridge. I don't see a small opening anywhere and I can't seem to remove any top or tip of the faucet. I tried to unscrew the handle, but I am stuck afterwards. Any help would be much appreciated.

#Faucet #Sink
Faucet Sink