To make tortillas, line the base of the tortilla press with a sheet of plastic wrap. Pinch off balls of dough from the masa. Center the masa on the lined tortilla-press base. Cover the masa with a sheet of plastic wrap. Lower the top of the press and push down the handle. Open. The tortilla will have plastic wrap on the bottom. Carefully peel away the plastic on top. Place your hand under the tortilla. Flip the tortilla onto the other hand so the plastic is on top. Carefully peel away the plastic. Flip tortilla onto a preheated, very hot griddle or comal. When the tortilla begins to dry on the edges, flip it over. Cook until the top begins to puff. Tap lightly with your fingertips to allow for even puffing and let cook for 1 1/2 to 2 minutes. Remove tortillas, wrap in a napkin or clean towel, and serve.