Toilet Flusher

How do you fix a toilet pasta?
Every time I flush the toilet, flushing remains low and continue flushing until manually force a backup. It is very hard to push back up, and always has been riding his own past.
Try to open the back of the toilet bowl The summit should come out fairly easily. To see if the lever or spring is broken or corroded. If so, you might need a new one, it could be as simple as something fell on it, but make sure the back is always helpful!