I know this is a few days old, but just in case! If for some reason one doesn't figure out how to eat (it happens every now and then with moths/butterflies) then hold it in such a way that the wings are gently held down (so they cant flap) and use a tooth pick to unroll the probiscis (mouth/feeding tube thing) and place it into the food. Once it is drinking, you can gently put its feet on something and let it's wings go so it can drink on its own.