There are plenty of You Tube videos on how to replace the screen. Here is just one link. As you can see it really just depends on your Xiaomi model. Also is it the screen that is cracked or the 'glass' in front of it (called a digitizer)? If the screen still displays then it is probably only the digitizer that needs to be replaced. The screen replacement videos on You Tube will also show the digitizer being removed, because usually to get to the screen you have to also remove the digitizer or alternatively once the screen is removed the digitizer becomes accessible.
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