How do I remove a toilet seat from a kohler skirted toilet

SOURCE: Quiet-Close Kohler toilet seat lost its quiet close feature

Hello len_moon, Look under plumbing in your yellow pages for a Kohler distributor. Also here is the web page for you part numbers. You will need the hinge assembly. Copy and Paste to your address bar. Hope it helps!
http://www.kohlerserviceparts.kohler.com/ServicePartsPage.aspx?DocumentID=c83b1f213d0545f984b01b9f0be37b9d&ModelID=558da26604ce43ec98c83fe8ed0aa604

SOURCE: Can not remove toilet seat from Kohler Rialto

to access the nut remove the tank lid, then go down and forward, its there.

SOURCE: can't change the toilet seat that broke

If your problem is like mine your toilet seat is loose and swivels when you sit on it. If you try to tighten down the screw it won't tighten. Use instructions above to remove old hardware.

To fix with new hardware

Purchase Hilti brand 3/16" x 2-1/2" Toggler Brand Toggle Bolt (Home Depot sells the kit). Kit comes with 10. You will only need 2. My last repair lasted about 8 years (with new kit = 40 years left or the purchase of a new toilet - whichever comes first). Set comes with 3/16 flat head screws. I recommend purchasing 3/16" 2" round head screws with matching flat washers. Sink Metal Toggler into hole with toggler pointing straight up (it's attached by long plastic legs). As it goes in the hole it opens up. Pull up on the plastic pull rings as tight as you can until the toggler is tight up against the inner porcelain of the bowl (similar to tightening cable ties). Line the seat up with the holes and it's new plastic adapter (that won't slip into the hole courtesy of Hilti). Slide washer underneath round head screw but on top of toilet seat assembly and screw directly into the newly installed toggler which is sunk in bowl/abyss receptacle. Repair should take around 5 minutes.

SOURCE: Kohler one-piece has no flushing power

Don't flush more water! Trash the toilet and replace it with a toilet that uses less water and flushes efficiently; practically every manufacturer makes a dual flush or eco model. Spend your money on a good toilet rather than paying for and wasting water every day.

SOURCE: kohler lowboy toilet seat does not have bolts underneath

My wife wanted to replace our Kohler low boy with a self closing seat. We got a Westport whisper close with unlock-able hinges for easy cleaning. I followed the above advice to use brute force to yank out the Kohler bolts. I then used a hacksaw to cut the new plastic seat bolts so that they would not extend past the thickness of the porcelain. I drilled the plastic bolts thru so that a small drywall toggle bolt would fit thru. Use a washer to prevent it from pulling thru, screw on the toggle and cut off excess screw length so it does not bottom out inside the cavity. Insert the assembly in the hole and tighten. Snap on & lock the Westport seat and you are good to go!