HELP Please :) How to fix the sink drain?

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Hello... okay i dont know how this happened but how do i fix it?

I pulled on the thing at the back of the sink, which makes that thing go in to stop the water from draining. and now when i push it back down, it is not coming up and the water is stuck there... like the water stopping thing is not coming back up to let the water drain through. ahhh Sorry i dont really know how to describe it better.

Can anybody please help me? Thanks sooo much :)