Back home (Canada) we used to make yogurt in a proper yogurt maker. (All you need is the yogurt maker, a thermometer -like the ones used to make candy- and the bacterias -your health store should have this on stock- Get the KEFIR ones, the very best).
Now here in Taiwan, I have learned how to use a rice maker to do my yogurt.
How to proceed? The pack of bacteria will have the complete recipe behind it. The important stage is mixing the bacteria - WITH A SMALL QUANTITY OF MILK AND THOUROUGHLY before introducing all the milk.
ANd then you put it in the yogurt machine that maintain the same temperature for the next 4 hours.
you put it in a tupperware container with the lid and in the rice maker - filled with water. You put your tupperware in the water and plug the rice maker the way you do when you only want the rice to keep warm, for the next 5 hours.