Take 3 tablespoons of yoghurt and put into the yoghurt maker container, plus 1 and 1/3 cups powdered milk. Add sweetener or other (the one I have setting at the moment is cinnamon and honey) and fill 1/2 way with cold water (I just use water from the tap). Shake well and then fill all the way up and shake again. Fill the yoghurt maker up to the baffle with boiling water and sit the yoghurt container in there. Leave it as long as you would normally, when making yoghurt from the packet.