Steps to take to ensure that a toilet flushes properly include unclogging it with a plunger or auger, making sure that the water level in the tank is appropriate, and fixing any problems with the rubber flapper and lift chain. The precise solution depends on the immediate problem, so troubleshooting to discover this is required.
Attempting to flush excessive toilet paper, sanitary napkins or any foreign object larger than tissue paper causes toilet blockages and prevents flushing. A toilet plunger is a simple tool that frees up blockages in the drain. Stick the rubber end of the plunger into the toilet bowl directly over the drain, ensuring that the resulting rise in water level covers the plunger's rubber cup at least midway. Pour water into the toilet bowl if there not enough there already. Keeping the plunger upright to maintain a tight seal, thrust downwards until contact is made with the drain, and pull up sharply without breaking the suction. This process should be repeated until the toilet is unclogged or stopped if no progress is being made, as this may indicate that the problem is elsewhere.
The appropriate level for water in a toilet tank is roughly 1 inch below the top of its overflow tube. A turned-off water valve may cause an insufficient amount of water to be held in the tank. Ensure that the valve is turned on and the water level is adequate, then flush the toilet to make sure that the problem has been fixed.