I know this is a really stupid question but I can't figure it out. I've had a dishwasher my entire life but my dishwasher broke yesterday and I need to do some dishes. It's the kind of stopper that is like metal and it has a black rubber thing in the bottom that is attached to a little stick. I don't know but I really need some help. I just can't get the sink to hold water.

It's like this one: http://www.plumbersurplus.com/images/prod/1/Ekco_15906902.jpg