How can I fix a sink stopper?

To fix a sink stopper, you can start by removing the stopper and cleaning it thoroughly. Check for any debris or buildup that may be causing it to not function properly. If the stopper is damaged, you may need to replace it with a new one. Additionally, make sure the linkage and pivot rod are properly connected and functioning. If these steps do not solve the issue, you may need to call a plumber for further assistance.