How do I remove the faucet to replace the "O"

get in a plumber to remove the unit and have anew unit installed

Did you get a cartridge removal tool a lot of kohler faucets require a tool to replace the cartridge,if that dosen't help what problem are you having more info on what exactly is the problem that you are having will help me to know how to help you.

first step would be to change the rubber washer or o ring.

1. buy a proprietary washer kit from any DIY store.
2. Turn water off at isolating valve on teh pipe underneath the sink / bath or at the mains and or hot water tank as appropriate
3. Remove the top of the faucet (often there is a plastic circle at the top that prises off to reveal a screw - mixer taps may have a grub screw on the side)
4. Gently using a wrench to loosen the nut unscrew and remove the tap (faucet) barrell (middle bit)
5. Remove nut that holds washer in place and remove it or, in the case of an O ring - prise it off with a pin or needle.
6. Reassemble in reverse order - do not over-tighten.

If that doesn't stop the drip then the seat that the rubber washer / O ring seals against may be pitted or grooved. Either buy or hire a 'tap (faucet) seating tool.

1. Turn off water before opening the faucet
2. dismantle faucet as above
3. Find which of the sleeve adapters that comes with the seating tool is teh right one to screw into the top of the faucet body
4. select the grinding disc that is closest to the size of the seat and screw it onto the end of the seating tool
5. Screw the tool into place in the top of the faucet body - just finger tight.
6. Pressing down firmly with even pressure (but not too hard) on the top of the seating tool rotate the handle backwards and three or four complete rotations.
7. reassemble the faucet but DO NOT close the faucet off
8. slowly turn the water back on and allow it to flow hard for a few seconds to flush and debris out of the spout
9. Slowly close the faucet and check for leaks.
10. If necessary repeat re-seating process

http://www.faucetdirect.com/mediabase/specifications/476install_051710.pdf

Here is where to find the manual for your faucet. The only tools you should need are a pair of slip-joint pliars for the main ring and the hex key tool that came with the replacement parts. Remove the handle by loosening the hex screw on the underside. Make sure to turn off the water before you go any further and you will need to turn off both hot and cold.

Remove the dome-shaped cover either by hand or with some pliars.

Pull out the ball with the stem in it and underneath there will be two rubber washers with two springs underneath. Remove the washers and springs and put the new ones in. Put in the new stem (ball with stem) taking care to line up the slot in the side with the nub inside the base. Replace the round washer on top with the triangle hole in it and put the dome shaped cover back on.

Before turning the water on, use the back side of the hex-key tool to tighten the nylon ring that screws down into the dome shaped cover. Put the handle back on and try the faucet, if it moves too hard, loosen the nylon screw a bit, if too loose then tighten it. Once it "feels right" you can reattach the handle and turn the water back on.

I suggest turning on the water slowly and look for leaks. Not as difficult as it sounds.

Sounds like the old style center-control delta type faucet, rubber washers describe older type but still good. The rubber seats have holes in middle, supply water to the cylinder which diverts water to the spout, and has a seal over top of ball allowing stem for handle.

Think they are talking about flex-hose type faucet accessory getting clogged, Maybe: lift the flex-hose faucet housing off the center-control faucet body? Water to it runs directly from center-control faucet and if broken seat gets in narrow line could inhibit spray.

Kitchen faucet spout too has an O-ring under where it connects to the faucet body. Unscrew large nut where meets the faucet body unit (slip-joint pliers), once free of threads, spout should pull straight up, easy or slight tug. I use bent paper clip to remove old one trying to save it in one piece so as to get exact size (that's important) to replace, push on one side then other.

I can fix this.
What is the last thing you did before this problem started?

Inside the handle of a Delta kitchen sink faucet is a small setscrew. You need an 1/8th inch allean wrench or Delta faucet tool to lossen the setscrew. Rotat the screw about 3 full turns counterclockwise, this should be emough to remove the hnalde. Under the Delta faucet handle is a white plastic ring with four notches. If you have a Delta faucet tool, you place it in two of the notches and slowly turn the ring clockwise to tighten the Delta ball assemby. This will keep the handle from moving by itself. If you do not have Delta faucet tool, use a pair of needle nose pliers in stead.

find the set screw on the handle loosen and remove handle, remove locking ring (a tool to do this comes with the replacement kit that you can buy from hardware store) remove the ball. You now have access to the washers and springs remove old washers and springs install new. reassemble in reverse. make sure not to overtighten locking ring.

"O" ring seal probably need replacement water off disconnect handle and remove valve remove "o" ring and replace

theres a little slide clip sometimes that sits inbetween the stem and faucet body look for that it may have one stopping your progress good luck