If your toilet handle is missing, broken, or just not working right, you may think that you need to call a plumber. However, there are some things you can try before resorting to professional help.The first thing to do is check the water level in the tank. If it is too low, the flapper valve may not close properly and this could be why the handle isn't working. To fix this, adjust the water level so that it is higher than it was before.If the water level is okay and the handle is still not working, check to see if the linkage between the handle and the valve is intact. If it's not, you will need to replace it. You can find replacement parts at your local hardware store.If everything looks okay but the handle still doesn't work, then it may be time to call a plumber. There could be something wrong with the valve itself and only a professional will be able to fix it.