you will find them near the Yangshao town. Just take the Floating Boat to Yangshao. once you arrived just ask local people take you to the Miao village near by.
If you know the place you can just rent a bike and biking to the village through the beautiful sightseeings....
I had been to this areas few times...and it was/ is pretty and wonderful place and people to see and good foods and a nice place to relax and enjoy the journey...