It sounds like the chain came loose from the handle. Take the top off the tank, and look for the chain. It should be attached to the handle or the rubber stopper in the bottom of the tank. If it's loose from the handle, tie it back. If it's off the rubber flapper, the flapper may be tore, and need replacement. To manually operate the composer, just lift up the end of the rubber flapper in the bottom of the tank. It's not that hard to change, just check out some YouTube videos.