How do I change the temps of water? "Warm" is too cold, "hot"is to

How to change water temps on Kenmore 400 washer? Washer has 4 settings for temp: Tap cold; Cool; Warm and Hot. The first two are basically the same, straight from the tap. The "warm" setting is only slightly warmer--about +10°. The "hot" setting is right from the hot water heater--no mixing. Question:, How do I adjust the "warm" setting to be warmer (+20 to 30°) or the "hot" setting to mix with cooler water?

I hope this question is clear enough, as I have a Master's Degree in English/Writing from the University of Michigan. Do you?