Please help... toilet problem
I am clueless about plumbing and I have no idea what the parts are in the toilet. But this is what is happening... my toilet is making a loud running water noise and when I look in the toilet, it is bubbling and it won't really flush. When I press the handle it just goes down. When I looked in the tank, it is bubbling in there too. But I lift this one part( it is big, round and black and connected to a little pole( forgive me for not knowing name parts) anyway when I lift it up, the sound goes away but that one part has to stay down... this problem has happened before and when I played with the black thing for a bit, it went away but it is constantly doing it. I even have to close my bathroom door because it makes so much noise.
Please help.I don't want to get a plumber and spend a fortune if I don't have to.
Thanks,
Jessica