i already watched them actually, they didnt show how to reharvest just the initial oneCheck out shroomery.org and do some research. Basically once you harvest the fruits you dunk the cake in cold water for 24 hours and place it back into the fruiting chamber.
Its gonna take you a very long time to learn how to grow if you ask 1 question at a time on a weed forum. Do yourself a favor and go on youtube and search "Lets grow mushrooms".
Watch the 4 videos, and check out shroomery.org FAQ. YOu can answer all your questions yourself with a little research.