This is a very hard system to open, more so when you have a damaged front glass & LCD.
Review this IFIXIT teardown of your system: [guide|17829|iMac Intel 21.5" EMC 2638 Teardown].
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Here is the previous model which is exactly the same as yours IFIXIT guide for taking off the display: [guide|15837|iMac Intel 21.5" EMC 2544 Display Replacement]
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Here is the previous model which is exactly the same as yours IFIXIT guide for taking off the display: [guide|15837|iMac Intel 21.5" EMC 2544 Display Replacement]. Here's a good YouTube vid on what you'll need to do: [https://www.youtube.com/watch?v=5jyMvGZDGdE|How To Take Apart the newer iMac 21.5"]
I would strongly recommend bringing your system to an Apple Store and let them deal with the screens replacement.
This is a very hard system to open, more so when you have a damaged front glass & LCD.
Review this IFIXIT teardown of your system: [guide|17829|iMac Intel 21.5" EMC 2638 Teardown].
Here is the previous model which is exactly the same as yours IFIXIT guide for taking off the display: [guide|15837|iMac Intel 21.5" EMC 2544 Display Replacement]
I would strongly recommend bringing your system to an Apple Store and let them deal with the screens replacement.