If your toilet isn't flushing properly, you can use a plunger to push anything stuck in the pipe through the system. Be careful not to flush the toilet if it's already clogged, as this could cause the basin to overflow.
Sink & Shower Clogs
If your sink or shower clogs, you can also try to use a plunger to clear these drains. Many hardware stores also sell drain cleaning tools you can use to fish debris out of the pipes.
Please don't use chemical cleaners as these could damage the system.