Cut a piece of parchment paper and a piece of cardboard just a bit bigger than your mold. Set the parchment paper down on top of the mold. Set the cardboard on top of the paper. Grab onto the mold and cardboard, and carefully flip the whole thing upside down. Set it on the counter, then carefully lift the mold up off the sugar skulls. The mold should pop right off. If the sugar sticks, it's too wet. Scrape it out of the mold, clean the mold, and add some more dry sugar to the mixture and try molding it again. If your sugar skulls do not hold together, the mixtures needs more water.