If you can move the pulleys manually the belt must be off. Is the belt gone? There should be a long belt turning all the pulleys unless it broke and fell off. If it is gone you need to replace it. Do not run the car without it. Your battery will not charge and the water pump will not turn causing the car to overheat very quickly. It will overheat too fast to even drive to a shop unless you live within maybe 1 mile of one.