Sorry for arriving to the party late...but as the others have explained, the clothes pin is just clipped over that flat piece, keep the lid closed, and slide it on, actually it the upper half of the pin that is holding that flap down....from there on, it will operate with the lid open...easy as pie
but anything would work as a wedge, a piece of wood, a rolled up wad of paper, a pencil, or even the bungee trick.....what ever you have around......I like the clothes pin best, easy on and off if needed....it must be at least 3 or 4 years that mine has been on there, and has not popped off yet....
yeah, some dealers/service men will increase the water level at the customers request....without vioding the warranty.....or you can do it yourself.....no harm done....
as for the lid switch, its basically at your own risk......just take the pin off if you have to call for service....