You can knead the dough by hand or machine. I use my food processor to do this. Whisk together the flour, sugar and salt. Add the milk, melted butter, eggs and yeast mixture and knead until you have a smooth and elastic dough. You may add a little more of flour or milk if you need it to achieve desired consistency of dough. You know your dough has been kneaded enough when you can make a windowpane out of your dough.