How do you fix a spacebar?

i popped off my spacebar to clean under it and not it wont go back on properly. i have to push down really hard to make a space and its tilted towards the screan of mylaptop. i dont know what to do.
Update: its so messed up. i tried taking it off so i could clean under it and not it wont attatch correctly. it wont attatch at all on one side. it keeps gettingstuck under the"m" key and i haveto press down on it really hard to make a space. help??
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