Instructions
Press "Start" to access the menu. Select the milker as your currently selected tool by tapping on it with the stylus.
Press "X" while standing next to the cow to milk it. Cows can be found in your barn, and each cow can only be milked once a day.
Press "Start" again. Select the "Farm Summary" menu.
Tap the picture of your face to show the status of your tools. There is a bar underneath the milker -- this bar gradually fills every time a cow is successfully milked. When the bar is full, the level of the milker goes up. For each level you gain with the milker, additional milk is produced each time a cow is milked.