<human>:  How do I fix a running toilet?
<bot>: To fix a running toilet, you will need to first determine the cause of the issue. Common causes include a worn out flapper valve that needs to be replaced, a faulty fill valve or flush valve, or an issue with the water levels in the tank. Once you have identified the cause, you can determine the proper steps to take for repair. This may involve replacing parts or making adjustments to the water levels.