Human: How do I fix a running toilet? Assistant: 
To fix a running toilet, you will need to locate the source of the problem. Shut off the water supply to the toilet and flush it to get rid of any remaining water. You may need to remove the toilet tank lid to access the parts inside. Look to see if the water shutoff valve is working properly and if the flapper or fill valve is stuck open. If the valve is stuck, replace it with a new one. Once you have replaced the valve, turn the water back on, flush the toilet, and the running water should have been stopped.