How do I replace drain hose

My washer doesn't have any wire around the hose. The hose is connnected to some kind of housing made of white plastic.

Do you mean the hose that goes to your standpipe, or the hose that goes from the drain pump to the plastic box(26) behind the washer?

In any case, to remove the hose (8) going from the back of your washer to the stand pipe, grab a pair of pliers and squeeze the wire fingers sticking out of the clamp (28) holding the drain hose to the plastic box on the rear of your washer. That relieves the tension of the clamp and, while still squeezing the wire fingers, slide the clamp up the drain hose a couple of inches. Then, you can pull the drain hose loose from the plastic piece.

Then, using your pliers again, completely remove the clamp from the old drain hose and put it on your new drain hose, about 3 inches back.
Then, stick your new drain hose onto the plastic piece and use your pliers to get the clamp back down to secure the drain hose to the plastic piece.

You should be able to figure it all out with no problem.